You're probably better off looking for a good beta, who has been tasked with providing concrit, than hoping someone will pop up off the internet.

Personally, I will offer concrit on spelling and misused words, but little else, and then only on stories I think are worth the effort of fixing. So either you're a good speller and have a functional vocabulary or your stories aren't worth the effort. Your choice! (Me, I'd go with the former, and keep my ego happy.)