I'm A Fucking Idiot(Assassin's Creed)

So idk why I've decided to create a new topic about this but it must be because i am mad. Anyways, lets get started.

Today while checking out the Steam Sale i had decided that i would finally buy Assassin's Creed 2 Deluxe Edition since i didn't have anything better to do. Now the thing was that when i was going to finish the buying process, the credit cards(which is my mothers) information had reset and my mother was not at home and her phone was broken so i couldn't call her and i had previously won some cards i could sell at the Steam Market so i just sold them fast but for a reasonable price(maybe too cheap). Now the thing was that after i had sold all the items i checked that i only had 2,46€(Assassin's Creed 2 cost 2,49€) at that time so i was very mad since i must have accidentally clicked on a wrong number or something(i accidentally sold a card for 0,11€ instead of 0,14€). So after i raged for a while my mom finally came home so i asked her if i could just borrow her card to buy some cash for my Steam Wallet. But the thing was that she was just going to be there for some minutes because she was going to go to her friend with my little brother(he injured his leg so this was the first day in some weeks were he got some fresh air). And since i am a 17 year old boy which had not been home alone for a while(for a couple of days) i decided that it was time to do a "fast one"(STUPID FUCKING INTERNET!) so the price doesn't change for AC2. So after i'm "done" i open up the Steam Client, for some random reason it had opened up the Store instead(i've deactivated that button) so i'm like "Okey???" and then i search for AC2 and i see that the price had changed! The game only costs 4,99€ now which is totally fine with me but the thing was that i wasn't only going to buy AC2, AC2 was just some time-wasting untill i could buy the other AC-games. AC2, AC:B and AC:R would have cost me about 10€(?) but now they cost me about 25€. Also since i was so fucking mad i decided to open up SteamGifts just to find out that i had won a game! Although i'm still waiting for him to "reach" me. He didn't write if he would send me the game via Hotmail or Steam so idk if i should be this happy.