Lets talk about introvert people, also, 10 copies of Hero of the Kingdom II.

It seems to me that most people don't really understand the meaning of the terms "introvert" and "extravert" nowadays. In fact, they have little to nothing to do with being social or antisocial, friendly or unfriendly or feeling comfortable or uncomfortable with people.

In general, introvert is a person whose primary goals in life concern himself. He wants to be successful and recognised, and his personal well-being, comfort and personal space are thus important to him. He can be great at interacting with people and have many friends just as well, but his main focus is self-improvement.

Extravert, on the other hand, is a person who wants to be helpful to others, to contribute to community and all such stuff. His primary goals in life concern other people, and his main focus is improvement of the things around him. Many extraverts can't actually put two words together, let alone be great or charismatic speakers, but their general behavior still make them extraverts.

I think the problem you're describing has to do a lot with confirmation bias.
For starters, just because someone has mastered the skill of public speaking does not mean they're by definition extroverted.

I can't speak for your experiences ofcourse, but I know plenty of people that can totally rule a crowd. But... After that they're completely drained.
If you just see them while they're on the stage you would think it comes so easy to them, yet if you actually befriend them and know them in their own comfort zone you know what it takes for them to do that.

And this is where a lot of misunderstandings come from. Being introverted does not mean you can't speak to a crowd. Nor does it mean you can't be the life of a party. What it often does mean is that doing these things will drain you.
Most introverts are more comfortable in smaller gatherings. They prefer to be with a small group of friends than with a large gathering of strangers.
Being around lots of people often is both emotionally and mentally draining. Whereas a lot of extroverts will thrive off of the energy that all these people give off. But in turn will feel absolutely miserable alone.

Another aspect that many introverts share is that they prefer to talk substance. As an introvert myself, if the subject on the table is something I care about or I am knowledgeable about I will talk a lot more. If its a subject I don't care for or am ignorant of I will generally stay silent and listen.
Which is one of my stronger assets, I can listen to people and have them just do the talking - at the same time that attribute throws people off because I don't do smalltalk. I don't care for smalltalk. If I have nothing to say then I will simply say nothing.
And for me? I'm fine with that, I don't need to be the life of the party.

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Now I think a relevant question here would be: "How old are you?"
While age isn't necessarily relevant per se, if you're younger then its entirely possible that you simply have not yet found your way around your own personality. It could be you need more time to stretch your muscles and explore your options. Sample the wares available out there and meet new people (as scary as that may be).

The reason this may be relevant is because it will open doors for you that you may not have known were there. And when I say meet people I don't really mean introduce yourself and get all buddy buddy. But just to expose yourself to different people and different mindsets.
Often times college or work will expose you to different people than you hung around with at home and in high school etc.
It will reveal that there are more ways to skin a cat, and that what you have thus far seen as "the ideal way" may not be the ideal way.
It may even reveal that some of the people you've perceived as being very comfortable with taking the spotlight have infact been faking it to get attention. It happens.

The key here is that you need to find your OWN path. The thing you are comfortable with. And not just constantly try to imitate someone elses path because it seems so easy for them. Just because they pull it off does not mean it will work for you. Ofcourse it also doesn't mean it won't.
But you won't know that untill you try. If you point out that you do not feel comfortable with some of that, that may simply be that you're trying to be someone you are not.

Our society has a very strong stigma that "extroverts" are the correct people and "introverts" are the weird and broken ones.
Yet in reality statistics show that introverts may actually outnumber extroverts slightly. We're just not as loud as the extroverts are.
Something that may well give you some confidence is looking into some celebrities and (historically) famous individuals that were introverts.
As this will put a strong hammerblow to the idea you've convinced yourself of that every successful person is extroverted.

But it'll also help if you define for yourself what "success" means. Speaking for myself again, I've never been drawn to the whole popularity spiel.
As important as it is for many a high school and college student, popularity is hardly the epitome of success. And often times its faked.
Its an illusion people clamp onto, to feel safe. But it rarely lasts.

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I can say one thing. I'm very strongly introverted and I'm proud to be.
I'm not the life of the part, I don't chat everyone up. And yes, in a room of 40 people I can feel quite alone.
But I have had time to explore my options and this is what I'm comfortable with.

In a similar fashion you will have to find what you are comfortable with. What you feel is important to you.
And if you want to be the public speaker, if you want to stand on the stage and take the spotlight.
Then that may mean that you'll have to work for it. You'll have to figure out the tricks and you'll have to find your way in it.
But... Don't do it just because you've seen some others do it. Find your own path, your own comfort zone.
And know when its okay to step out of it. Because sometimes you'll have to leave your comfort zone, thats just how life is.

Hi, sad sloth here.

"... everyone is laughing, having a good time overall, and yet, I'm there, without enjoying the time being, afraid to say something"

I don't think you can change the way you feel about these kind of situations.

"Most of the successful people I've meet or seen (in person), share a common trait: They're extroverts".

That's because extroverts like to be seen, introverts can be just as successful.