Pay attention to your lower 3 chakras, chances are you're over-thinking and disassociating too much when you talk to girls. You need your perception to be more cool-headed and grounded in who you are.
And a simple reminder, confidence goes a long way. Work out, practice a sport or martial art, and start studying subjects that interest you. Having confidence in your intellect is under-rated.
This naturally increases the chances of people or girls Wanting to talk to you.