Firstly, I have to say that having many of any type of friend isn't important. As long as you have friend that are important to you, good friends, that you have fun with them and that you're there for one another, that's what matters. Even if the majority of your friends are girls, having friendship at all is the important thing. I'm sure you have one guy friend, so it's not like you have missed out on the experience or something. Enjoy the friends you have and don't worry.