I HAVE DIFFICULTY TALKING TO PEOPLE. NO GF?

I'm a quiet person. I'm not quiet because I have fear speaking my mind. I have severe BMS (Blank Mind Syndrome). I have extreme difficulty thinking of stuff to say when I'm around people. I even have difficulty talking to my own mother. Getting me to talk is like trying to get a person having an asthma attack to breathe. I'm comfortable with who I am and I am pretty confident. I feel like trying to talk to girls when I have difficulty with it would be a waste of time. I do the best I can with what I have. So, how can I be successful with girls.