What the heck is wrong with me?!?

My boyfriend and I have been together for like 10 years. I love him and love having sex with him but something shifted in the past few years. Don’t know how or why but my anxiety has gotten much worse. I get so nervous and awkward about sex. I want it but my anxiety stops me. It’s been 5 months since we last had sex and I feel like the worst girlfriend in the world. Hes stopped trying probably from all the times I turned him away.. even though I wanted it!! Ugh. Anyone have some tips on working through this anxiety????