2 things almost guaranteed to mess your game up
1. Fapping... you will lose your drive to get girls instantly. Why go out when you can just pleasure yourself from the comfort of your own home! Seems like a good idea but you will regret it every time. Store up the energy and use it to propel your game in the right direction. You need all the drive you can get to overcome any shyness / insecurity and actually get off your butt and do what needs to be done.
2. Smoking Weed. Instant game killer. If you smoke weed and are trying to overcome any insecurities and shyness you WILL FAIL. If you are stoned and try to pick up a girls you WILL FAIL..unless they are stoner girls ;)...but EVEN THEN. Anyone who is lacking girls and smoking weed, stop smoking weed and you will instantly step your game up big time.