I agree with some of the other guys. Because I did not have many opportunities to interact with girls in my teen years (all boys high school, over protective parents, etc.) I am where I am now wrt my marriage.
But let me throw a wrench into the works. I believe that a large part of my problem was excessive honesty. I desperately wanted to get close to some girls, but I was deathly afraid that they would find out. Duh, they all knew! A large part of the dating game is creative dishonesty. Flattery is almost never purely factually accurate. This is a lesson I am just now learning.
Yesterday I saw my DD8 knocking on the shoulder of a boy in her class. Knocking like you would on a door, not hard. I looked at her funny and she said, "He doesn't mind." And you know what? It looked like he didn't.
