Why can't I find "my people"?

I’m in my late twenties and have been in and out of various social groups and communities for years—but still, I can’t seem to find one I feel comfortable enough to feel like I can finally relax and be myself. Is there something wrong with my attitude or have I just been unlucky in this regard?

For some background info, the extended family I grew up with are also very different from me. I never felt a sense of belonging. I don’t know if this affects my present situation in any way.