I want to say this nicely and I hope you understand, "Just get out there and do it!" Most all pick up artists have some AA in their head or stomache still. I know it comes back from time to time on me and that's after some like 80 field reports now. All you can really do is just plow through it.
The second thing you can do is go to those particular bars or clubs more often so you become more relaxed in there. Also, while you're there if you don't feel like approaching women, try befriending the people that work there. That helps me relax, when I know people where I go.
YOU CAN DO IT MAN!
