so all my friends are gay and i want to become gay but i don't know how
That sucks eh?
you can't just become Gay...
I am gay but never chose to be gay its just natural. Heterosexuals are attracted to the opposite gender. They can't just decide "hey I'm gay now" because that's not what their instinct tells them.
This sounds so weird that you would want to be gay when your not, it seems impossible. I can see any other reason for you to want to be gay unless it's for Attention, but all you have to do is, deal with it! Because their is no possible way you will ever be able to become gay xx.