First off, congrats on your success. As for you question, you mentioned this:

Quote Originally Posted by missmisery
... all my pocket pairs get cracked by sets (and I have some problems laying AA-KK post-flop on a non-scary board), I miss the flop 99.999% of the time, and when I hit it, someone will draw out on me. I also made a few really bad plays that I rarely do (kind of a semi-tilt.. calling even if I feel I'm beat just because I've put too many chips in the pot, etc.) , and I'm losing big time. Also, my big hands are not paid off like they used to at NL100. And on top of that, it seems like most of my c-bet and bluffs are called.
Honestly, it sounds like you're a little over your head right now. It's good that you've recognized why (c-bets getting called, not getting payed off, etc). It looks the competition is just a lot better than what you faced before.

However, to think that you must stay at 100NL for the rest of your life is saying that you don't ever think you'll improve. You should definitely stay at it until your bankroll can't handle it anymore. Emphasize learning while trying to at least break even (sounds like you're running bad, so you should be able to handle this when you're running normal). If you're still playing badly lik e you said you were, then drop down and get your confidence back at the 100NL tables. Then try it again.

Good luck!