I masturbate everyday but my girlfriends said only boys masturbate. Is it wrong to masturbate?

It is completely normal and natural for both girls and boys to masturbate.  Masturbation is healthy and is a great way to explore your body, discovering what works for you sexually and what feels good.  Go ahead and masturbate as much as you want, as long as it feels good and you enjoy it then it’s a healthy and fun thing to do for yourself.