Are you a proven winner? Please help.

I am in need of someone to help me improve my game. I normally play online, usually small stakes tourneys ,or ring games of 2/4 or 3/6 limit. I recently played a few NL ring games, but got creamed. One of my problems is that I am so inconsistent. For a month or two I win, only to blow whatever profit I had in a relatively short losing streak. I have read a few books, watched everything I can find on TV and read on 2+2 everyday. I think I am grasping the overall concepts, but I tend to do stupid things that cost me. I don't have the knowledge to figure out what I'm screwing up. I've seen a few posts here where people suggest finding a good player that would be willing to coach, whether that's during live play or just reviewing hands, I'm not sure. I am sure that I need help. I want to get better and will work to do so, I just need to know what the heck I'm supposed to work on. Any responses will be greatly appreciated.