Maybe you feel intimidated. Maybe you feel competition. Maybe you like feeling "special" as being the only girl among your guy friends that probably give you attention.
I also used to hang out with only guys. I used to think that girls just didn't like me or that they were jealous of me. Truth was that I was full of myself. This was wrong of me. I missed out on the girlfriend relationship and you know what....some of the girls I met later in life have been with me through thick and thin.
All the guy friends you have now will vanish little by little as they too get girlfriends. The girls that make an attempt to be your friend probably think of you as stuck-up because you think you're a better person than them....cause in your mindset they are just catty, gossiping, jealous girls. You know what I've discovered? Men are worse gossipers than women!!!!
Give EVERYBODY an EQUAL chance to be a friend to you.