You could be Bisexual or Bi-curious, depends whether or not the man meat does it for you, or if the lady parts do it instead.
Not making light of your issue, rather I can't think of another way to put it; do you want a lady friend to put a penis in your pooper or a man instead? Only the later choice would really make you homosexual/bisexual. The anal cavity is, *and forgive the punn/play on words* a cave of mysterious pleasures. for those straight and gay/bi. So I'm told, word on the street. Moving that aside though, love is love - If the feelings are there on both sides, you need to simply find the one where your feelings lay deeper.
What does being a guy or girl matter? a lot of the old ways of looking at things are fractured and broken, humor whatever feelings you have for what they are, in there purest form. If you feel you like this guy more then this girl, try it. See what happens, whatever your choice, cherish it. A love will never come the same again.
In whatever choice you make, if it ends up not being what you hoped it to be, or what you wanted it to be, do not worry. Love that love for what it was, and move on. Although another love the same will never come about, that's why love is love. theres an infinite amount of ways to express it, so theres an infinite amount of ways to experience it as well.