Just go out and meet friends' friends. Treat everyone the same, guys or girls. Respect all types of people, and you will meet lots of people.
The key point is not to focus only on girls. If people feel you only want to meet girls and bang them, they won't want you to meet their friends. Focus on friendship and human interactions. Let girls want to meet you instead of trying to meet them is the easiest. No effort, just be a nice and friendly person with some substances.