Seeking advice/help!

I've been having very low sex drive. Like I don't even get turned on my watching the graphic sences in Shameless anymore 😂 I do find my boyfriend very attractive. But I don't know what's wrong with me! I want to please by boyfriend by obviously just having sex with him more than once every two to three weeks. But I don't know what to do. I've been taking Vitamin D pills but I can't seem to get out of my head when were fooling around. it's obviously very frustrating and I don't know what to do. I've been feeling unattractive and fat lately but I've taken two pregnancy tests and those came out negative so I don't know what's going on!