Take a deep breath. It's okay. You actually have friends who aren't guys, you have girl-friends and I know it's overwhelming, but don't over-think it.
Growing up you were probably one of those girls playing tackle football after school in the park and didn't understand why all the girls in your class wouldn't play anything but jump rope or hopscotch off the grass at recess. Not that you didn't love jump rope or hopscotch but what about kickball and red rover?
You have your girls of maybe 5 that you're still close with from high school, but you know them from sports, and you've known them for years, so they're more like family and have to put up with you. Those are your girls the ones you've surrounded yourself with for 8+ years.
Making friends with girls is hard for you because they're mean. We girls are so mean. It is so much harder to make friends with girls compared to guys probably because we're intimidated by the other, where a guy is just a guy, talk about some sort of sport you're into and instant friends.
Behold the sky has opened up and the sun rays are on you because the day has come where you find yourself with new girl-friends and you're not sure how you did it. You somehow managed to meet some cool, chill girls and now you don't know what to do with yourself. It's almost like that awkward moment when you don't know what to do with your hands.
You're thinking things like, "what is the proper etiquette for this kind of friendship? Is it okay to invite them over to watch football games? Will I scare them when I yell at the TV?"
Being out of your element is not something you're used to, but calm down. Yes, with the guys you've never asked yourself these silly questions and now you have no idea what to do, but if you made friends with these girls then chances are they're into what you are, they want to get to know you too, and they're somehow connected with the guys you hang out with; so you already know you'll get along if the dudes like them. Enjoy the fact that you have new chicks to talk to about your guy problems, you can actually dress up to go out now once in a while, (because you are a girl and you like to get fancy sometimes), and when you get into those girls vs guys arguments you have some backup on your side against the guys in the group. Which is always nice because you already know your right, but now you have some voices to chime in alongside you Getting to know people is so much fun so just relax, be you, and enjoy this new experience. Take the rest as it comes and make some memories with your new gal pals!