Well Seddit, I guess I need your advice.

So, Last Saturday I went to the mall with a buddy of mine. As we were walking through the mall, I noticed a real cute girl sitting on the bench with her friend, and she noticed me too, I guess. Me and my buddy sat down in this area as well, and then it begins. I looked at her, she looked at me. As the shy guy I am, I couldn't hold the eye contact long. But I looked again a couple of times, and she smiled at me, played with her hair, and all this stuff. At that point, I really wanted to man up and go and talk to her, but shit. My mind totally fucked up my confidence. It just went like "oh man, those aren't signs, you are not gonna have a Chance with her, blabla". So I did nothing and me and my buddy decided to go home. When we were about to our trainstation, I looked back, and saw her again, they followed us. But my mind went on and on with the game, and I couldn't do shit. Just kept walking towards my train. Then, right before I got on my train, I heard her saying "Bye, Hope to See you again" and waving at me.

The saddest Part is, the same Thing happened a few weeks ago, except the "Bye"-Part. With the same girl...

I mean, on one Hand i really think that those were pretty obvious signs, that she wanted me to talk to her but on the other..I just don't

So guys, I need your help. How the fuck do I get my Brain to shut up, and just go for it, without overthinking the whole Situation?