I'll chime in with the others and suggest not worrying about "orientation." It's not like you have to register for one party or another, it's something that you'll find a "comfort zone" with others, usually more in one direction than the other, but not always. There is certainly nothing wrong with you.
Remember too, that same-sex experimentation is way more common than anyone (or at least confirmed heteros) will admit. Just because you end up wanting to try an encounter with another guy doesn't mean you're gay, or even bi, it just means you're curious.
You may find a natural affinity for one gender or the other, and it may come to you soon, or it may take years. The thing to remember is you are your own person, and free to find out what's right for you in your own way and time.
Just do it safely, please.