I'm not interested in sex

I'm a 19 y/o female, I masturbate almost daily (sometimes twice) yet I don't care about having sex. Last year I lost my virginity and have had sex many times thereafter, but I just don't care for or about it. There's no pain or any discomfort, however when I'm having sex I'd always ALWAYS rather be somewhere else. I just CAN'T get excited, sure I'm lubricated, but I feel like I go numb. My mind wanders, I think about books I could be reading, short stories I could be writing, grocery lists, calls I need to return, etc. Everything except the actual act.

I've never been raped or molested or anything so I really can't explain it. I haven't had sex in 3 1/2 months and while my friends are in shock, they absolutely cannot believe that I could have "gone so long" without it, i'm perfectly ok with it.

I know i have a healthy sex drive, and wish i desired the real thing but I simply do not. I know it could be that my former partner (my first AND last) didn't know how to please me, but he tried so hard to get me to a heightened state of arousal that I actually got tired and irritated that he couldn't be one of those selfish b*s***ds who "got off and got on with life." I ended up likely doing a HUGE disservice to myself and his future female partners by faking orgasm after orgasm (really well might I add). If he is a terrible lay, I probably would know the difference.