If you don't use it you lose it???!

I started having sex at 16 and I always had a healthy sex drive (I am a girl). I haven't had sex since like July? but it was a one time thing and completely bland and unsatisfying. I can orgasm through masturating with my vibrator but I don't really get wet and it's just boring. I guess what I'm trying to say is that my sex drive is practically gone and I am 20?? Why is this do you think and can I get it back.?