Try not to think too much! Most guys think about the worst thing could happen. Instead of hesitating and thinking about what's the best way to approach that girl around the corner, just go up to her and say 'hello'. Don't say anything else. All you want to do is to be a friendly stranger and not some pervert who just want to have sex with her. Do this a couple of times with a lot of girls, and eventually your fear would subside plus, you don't have to remember any lame pickup lines.
