Is there anybody out there? No one can understand me?

I feel like no one understands me, not even my closest friends or family. I'm 15 and I have a few friends but I never feel like, completely good when I'm hanging with them. Like their friendship doesn't satisfy me if that makes sense...And I feel like I'm judged all the time and I'm always afraid of showing my true personality. I love camping but no one I know besides guys my age are into that, and guys my age are only interested in hanging out with cute girls on dates, not out in the woods. My dad has always gone camping & hiking with me but I don't want to hang out with my dad my whole life. Even though I'm not lesbian sometimes I wish I was a guy so I could be myself and feel good. I mean all the girls I know just want to gossip about other people, and if they aren't like that, they're just nerdy or emo. Except for these two twin nerds who are cool and that actually do hiking and camping like me, but they despise me. I think back on my childhood and think it was so much better back then. I wasn't insecure and could play however I wanted and not be judged. I had this friend named David who did actually understand me and was my best friend, but now we're older and don't talk much and he's more into church things now and I'm not religious at all. I'm wondering...is there anyone else out there like me? Is there someway I can find other people that do the same things I do...I just feel lost.