[HotDamnImAPhiMu]

Congrats! Go you! Sounds like a great opportunity... small companies are often a great place to start because you can get SO much experience, if you know where to look.

Don't forget the "concerns" your interviewer had - go out of your way to prove how wrong s/he was, especially the first few weeks when people are forming first impressions about you.

I always worry about how young I look - I'm 24, but look about 17. I've had interviewers express to me before that they worry I'm not "old" enough for the job (which is great, actually, because it gives me the opportunity to explain why they're wrong by referencing other jobs I've excelled at, relevant experiences, offer personal/professional references etc.) It sounds like your interviewer may have had the same misconceptions about you.

I bet you're in the same situation I am -- where the proof is in the pudding, and after seeing your product and your composure the interviewer won't be able to believe s/he EVER questioned your ability to handle stress!

But it doesn't hurt to go out of your way to prove 'em wrong - for instance, I dress *very* conservatively the first few weeks. No jeans on Fridays if they have a "casual fridays" policy, etc. And when I'm talking to coworkers, I don't talk at all about boyfriends, what I did last weekend, etc. After I've been there for a few weeks I don't worry so much, but it's really hard to change a first impression.