Awkward silences suck, but once you get a li'l out of your teens they occur less often. A) as you come out of your teens you are actually less physically awkward and B) you begin to learn how nice a good comfortable silence can be.
So, my first tip, get a bunch of conversation openers under your belt.
If she wears something advertising her taste in music "Hey cool (item). Did you hear (name of bands) new track?" OR "Cool (item). I've never gotten into (name of band) what album would you recommend I start with?"
'People are never perfect but love can be. People waste time looking for the perfect lover rather than creating the perfect love' - Princess Leigh-Cheri from Still Life With Woodpecker.