[rlt]

If it helps, you're definitely not alone.

I'm 25. By all accounts my life is pretty good. I've got a fairly promising startup going. And yet I feel like I haven't matured at all since midway through college. I don't feel like I imagined I would at 25.

[Cyranix]

Another 25-year-old in the same situation (not leading a startup, participating in one). Many thanks to the OP and all commenters; it seems like there are a lot of eyes on this thread.