That cause by you think about what will happen so much, you try to show up your skills or knowledge with women while you don't have own so much. But that don't is right way, it only mean you fear or you don't know what is right way. So you need keep normal and be yourself always take deep breaths and be freedom and relax, say to yourself that talking to a girl isn't such a big deal.

  In fact you meet and talk to many women in your life, so this woman only same with other women that you told in pass. So when you have peace of soul and have confident about normal things then go to women you like and talk with her.