Its like to going into fight - you gather courage to do what needed an win or fear burns everything around you and lose. Any negative thought will make it harder. You reduce them by acting immidatly(wait 0 seconds) from the moment you see her - even run if you have to get to her to faster start talking - thats what pickup artists do. Living in the moment. Thats what your problem you been thinking too much and doing nothing. Imagine you see a beautiful girl and first though is positive right? Like shes beautiful etc. but you hesitate and stupid thoughts like if im good enought, will she be interested in me, what if? Problem is you never failed thats why you are afraid to fail. You think everyone wil think you are loser if you mess up with her and she walks away. The truth is no one cares, you have permision to fail -its ok. Like Basketball player jordan said - I failed so many times and thats why I sucseeded. It doesnt matter if you try100 times and fail. What matters is that one time when you sucseed. Think all the way positive and you gona be ok.
Here is some exercises to feel and sound more confident.
youtube.com/watch?v=nzK3g0pT250
Exercises For Building Confidence
youtube.com/watch?v=P41ER1Wmkj0&list=PLzVsXrkgRGcmKuP1hx-ApdpIztC4de4Jp
How to say NO! and squash bullies forever
youtube.com/watch?v=K64Oz83swmA
5:00
Fear of public speaking
youtube.com/watch?v=m2MSC8G_f50
And here is some examples how to aproach girls
youtube.com/watch?v=Ok0y5ZbObDg
You maight want to check out some SimplePickup videos too just for fun and SashaDaygame videos for educating reasons.
Doubt kills more dreams than failure ever will