Is something wrong with me?

I'm having a problem with sex. Don't need it and anytime my SO And i have sex I feel nothing at all. I just fake noises. I've been like this with my past relationships. I kind of feel bad for my SO. I can go a while without and not even care if i get it or not. Is there something I can do to change this. Also anytime he goes down on Me i can't help but laugh because it tickles