Have you spoken to a health professional about this? I feel like this is a symptom of something else. I have a very mild diagnosis of schizoid personality, for example, and I often feel disconnected from people. Or sometimes my husband says I'm acting like a zombie because I don't respond the way I should (happy but not smiling, surprised but not showing it, etc.) But I know that people who are fully schizoid do not feel the desire to be emotionally connected to people at all. This is just an example.

I don't know if it is very healthy for you (mentally and physically) to be having sex all the time, especially if it is upsetting the guys you are with. Perhaps you should take some time off from that until you find out what is happening with you emotionally. Sometimes allowing ourselves to heal, even when we're not sure what is wrong, is best.