I think I'm gay?

I think I'm gay for the first time in 18 years I'm starting to think about having a serious relationship with a guy. All my life I thought I was straight I thought women where the only choice.This is very hard for me, all my life my parents have expressed their feelings for gays and sometimes it's not so nice I know they would be accepting but I don't know how accepting. My friends are pretty much the same maybe a little worse.What should I do?Please keep profanity at a minimum and post professionally