tired of rejection

I'm so tired of my boyfriend not having sex with me. We live together, but we only have sex about 4 times a month. Foreplay is minimal. Rarely make out (maybe once every couple of months). I don't feel desired in my relationship anymore, and I fear that this is what the rest of my life is going to be like. I try to talk to him, but I can't force someone to want to have sex with me. I don't know what to do.