Some excellent advice in here. Wouldn't hurt to print the thread and take it with you. I'll share a story with you.
Before I learned about stance, stroke, etc. and I was playing in bars all the time, I was no different. Couldn't play without a few beers in my system. After learning proper fundamentals, I actually play worse the second I take a sip, so I prefer to stay sober when I play, which in turn has effectively killed my drinking habit. Once I started competing, I couldn't play in tournament or singles league matches without shaking due to adrenaline or performance anxiety. A great piece of advice I received was to just accept it and incorporate it into my game. It took some time, but I just checked rankings and I'm 12th in my singles league right now, and I expect I'll be rated a B at a minimum by the end of the year. And all those higher-level players? Playing them is what made my game skyrocket. Once I knew that I would be punished for my mistakes, it completely changed my approach every time I got a turn at the table. Now I look forward to those opportunities to play those B+ and above players. So... in short, my advice is to stick with it, and seek out those challenges. Learn something from every match you play, and you'll never lose again. And go to David Sapolis' facebook page and read his "Blackjack's random thoughts" posts.