Please Help!

After starting birth control, it feels like my sex drive has just completely disappeared. My boyfriend of 5 years thinks I'm no longer attracted to him but thats not true.

I want to have sex with him but I just don't feel in the mood anymore. I'm only 21 and I've talked to my friends but no one else seems to have this problem. Is there something wrong with me..? Does anyone know what I can do to fix this?