how do you hold yourself from csgo keys?

Its easy, you just stop being a retard.

It's like buying a lottery ticket and hoping to get the big prize.
Nothing of what is inside those boxes will boost your gameplay anyway.
If you are a skilled player, nothing of what is inside those boxes will ever change your gameplay, if you are into competitive level.

Every time you get the urge, just go use the case opening simulator and watch your shitty skins/money wasted pile up. That should take care of the allure. Alternatively learn a bit about statistics, look up some of the analysis other people have done on the chances of "winning" good skins, and realize you might have better "luck" if you played certain games in a casino.

Ps another pro tip: all those cool skins you see fly by? They DONT EXIST! The outcome of the case is predetermined, meaning what you land on is what you were always going to land on no matter what. So that knife you just narrowly missed? Yeah its just a trick to make you think they are more common and keep paying to try for it.

Lol, it's like gambling addiction... You have so low chance to unbox a good item like winning the lottery. That's what stopping me. And i don't buy lottery either.

If I want a skin I just buy it instead of taking risks

Simulators . Or open 10 cases for fun. You know just for fun.

Easy... I just don''t play it. Because I don't like it very much