Girlfriend has low sex drive, I can't turn her on, we're 25
Hey all, I've been with my girlfriend for about 2 years off and on. We had a rocky start when I didn't want a serious relationship and broke up in February, but we've been together about 4 months now (since August), it's been serious, we talk about a future, we see each other every day, it's very affectionate and supportive and seemingly healthy relationship. Recently her sex drive has dropped off.
When we first got back together, it was nearly every day, which was great. Being around her always seems to put me in the mood. But recently it's down to about twice a week, and whenever I try to get her in the mood, it only works if she "wants to have sex." I'm worried because the only times we have sex is when it's on her mind, otherwise, there's nothing I can do to arouse her. There's plenty of kissing, cuddling, what have you, but since we're not having that much sex, I feel like I'm always in the mood and try and have sex and I'm frequently getting rejected. What's worse, we'll fool around to a point (at which I point I'm REALLY in the mood) and then she'll drop the "oh we're not having sex now" line. I can't ask ahead of time because that kills the mood, so I'm either stuck being frustrated for getting worked up for nothing or just waiting for her all week to make a move.
She denies there's any problem with our relationship, but I can't help but feel like there's something wrong with me. She does have a history of anxiety, takes Wellbutrin every day (but she says that increases her sex drive, there's research to suggest it does too). She recently increased her dose of it, but otherwise no changes. Takes Ovcon for birth control (which is a monophasic birth control pill).
She sometimes says she isn't in the mood because she's tired or stressed, but I feel like if we're having trouble now, is she ever going to want sex if we get married, have careers, kids, and bills to worry about? She assures me we will, but I'm sure everyone says that. I don't know if I should be worried or not, or if maybe there's something wrong with me. I do feel insecure when she turns me down, like I'm not sexy enough for her or something to that effect. Should I be worried about us and our future? Is this a problem we need to deal with, or should I just suck it up as this being a phase or just accept this is how much sex she wants now. Sorry for the long post, but it's my first. Please advise.
Thanks.