I like this guy he don't know I like him though sometimes I really wanna touch him penis and I pretend that I actually touch it by accident but i do it in purpose what should I do does this make me gay
Only you would know if you're gay. It doesn't matter either way.
I'm guessing you are in your teens. It's NORMAL to be curious about others. You want to know if you're "normal" and what things look like or feel like. As long as you ask him and he lets you there is no harm in touching him.
You might try to bring up the subject of "touching" with him. He may not know how to ask you either.
Hope it helps.