I think I'm hi, but I'm not sure.?

Well, I believe at such a young age, it is natural to feel uncertain about your sexual orientation. It's still in the process of evolving, so it's not a problem if u don't know what do u identify yourself with. There's no need to rush, these things usually work themselves out. But if u do find both boys AND girls equally attractive, then yeah, then I'd say u do have bisexual tendencies indeed. But I'm not an expert, this is just my own personal opinion. Hope it was helpful, at least a bit.