Ok look at it this way
When you realize that you are attracted to either females, males or both
You decide that you are gay meaning you still choose it because you belive it is how it should be, and it is a comfortable choice sexualy seeing as you aren't attracted to females. And if you are attracted to both you choose to be Bi but my opinions on Bi are too crude to say them out loud on this site..
I'm tough, rough, ready and able
To pick myself up from under this table
Don't stick no sign on me, I got no label
I'm a little sick, unsure, unsound and unstable
But I'm fighting my way back