As the title reads. How am I just supposed to accept it. It drives me insane. Of course I know that people are more attractive than me, but people are more attractive than him but I'm not just turned on by the thought of them. I only want to fuck him. He just has friends that he sees a picture of and imagines fucking them, just fantasizes about people he's around, and I'm meant to not feel threatened or upset? I'm hypersexual and even I don't do that. 

Apparently this is a pretty normal thing and most people just accept it with an "oh well, what can you do" attitude. 

Obviously this is toxic thinking but I literally cannot help but be upset when the thought intrudes into my brain. My stomach drops, I feel nauseous and (TW) want to hurt myself. It feels impossible to calm down and not split.

Any coping strategies that aren't self harm would be extremely helpful.