I think what is important is figuring out how you feel about your friend, moreso than what your exact sexual orientation might be? Webgoji is totally right, most people don't fit into a rigid category. I would just pay attention to how you feel when you are with your friend that you might like as more than a friend but aren't sure yet. When I was a teenager, I realized that in the past I had crushes on girls (I'm a cisgender woman) but hadn't realized it. Do you get that stomach flip kind of feeling? That is always how I identify that I like someone as more than a friend, that nervous, giggly, "oh he/she is so cool/great/whatever." That feeling that something is different with this person than with most other people.