if we are just talking about the courage to approach and go for the kiss etc... Well there are a few things I do -
if you are feeling Fear to approach a girl, then you are assuming something bad is going to happen. Then just simply change fear to faith. ASSUME SOMETHING GOOD IS GOING TO HAPPEN - - - You are going to have FUN!! Assume that always.. You are going to have fun!!!
The biggest fear of approach is being rejected - But just have faith that even if you do get rejected you will still be having fun and doing what you want!! You will be living the life and doing the things you want to do.
Same with kissing her - If you want to kiss her then Just assume that its ok to do it - Just do it. You gotta man up - - - Confidence has a lot to do with believing in yourself. If your main goal should be to always have fun and to always do what you want! And believe that its ok to do whatever you want. Thats confidence - You are good enough, Do what you WANT, have fun!
...One trick i used when I first started up - The first weekend i REALLY went out I decided I was going to see how many rejections I could get - So that made it ok for me to fail - Looking back I would never do this again, but it did get me to approach over 100 girls in one weekend - Talk about smashing through the fear of approach.