My girlfriend doesn't get turned on anymore

Anon because...clearly don't want this to be seen by people we know. So, me and my girlfriend have been together for nearly two years now, and up until recently our sex life has been amazing, I've never been with someone whose libido competes with mine, until her. But recently (since May) it's been dwindling, until last week when she admitted that she doesn't get turned on anymore. She seems to enjoy it once we get going, and I make an effort to please her, and turn her on, but she doesn't want to force it. She's got a s***ty home life, and stressful time at college (performing arts), and is also on the pill. Not that our relationship's built on sex, but it's a big part of it and me, being 18, have a large sex drive. It's eating me up though because I can't help feel it could be me not being good enough, or she wants someone else, or that it'll just never go back to normal. Also I feel sh**, like she feels like I'm forcing her when I'm horny, which I would never do. I don't want it to ruin us, like I say, we've been together for a long time, and we're good together. Please help guys. Thanks

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