Your behaviors are your own. They aren't necessarily gay or straight. So get it out of your head that saying, I dunno, "tuna casserole" means you're effeminate or anything like that. Seriously.
Same with how you walk or whatever.
It's more about how you feel, who turns you on, who interests you.
I suspect you're bi, if you really need a definition and a name for things. Sexuality is a spectrum, and most people live in the gray-shaded area. But I also suspect that you feel shame and don't want to come out (yet, or maybe never).
Now, are you any different than you were yesterday? Probably not.
What to do differently?
Seriously. You now have a title.
So go and be happy. Don't use people. Don't be nasty. Use protection, from STDs and from pregnancy. Be a good guy, whether your partner or your date is male or female.
Go and be happy. Labels are for clothes. Titles are for books.
You're a person. You're gonna be fine.