How Can Low Libido Be Treated?

Hi, I ve been having sex for a few months with my boyfriend and I m disappointed to say I m not enjoying it. I ve tried everything. Different lubes different positions, oral and even tried spicing things up a bit. Nothing will work. I m 16 and I lost my virginity to my current boyfriend. When he penertrates I get sore pains in my stomach sometimes it s really sore and sometimes it s bareable and sometimes I don t have any pain. A lot of the time I struggle to get wet but when I do I get really wet. It hurts to be fingered and my sex desire is very low. I can t even please myself. I m annoyed and frustrated. I want to be able to have a special connection. I m using yasmain birth control and have been for over a year I started using it for my pimples. I don t know if that has side effects of less sexual desire. I ve had discharge ever since I was about 11 everyday it s sort of a yellow colour but I ve gotten a lot of test and they said there is no infection. I don t know what to do and it s causing problems in my relationship. I love him so much but I m afraid he is going to leave me because he thinks he can t please me. Please help !