I think I'm better than my friends at video games
Is there a reason behind your skill at video games?
I practice more than anyone I know at them and I'm more determined.
It is awesome that you practice so much at games and so feel like you're better than them. However, if you always put down your friends and beat them too hard then they may stop wanting to play games with you.
I just thought I was the best at the game and I didn't know I was being arrogant.
It's good that you recognize your arrogance. Making others feel inferior is not a good habit for lasting friendships.