We here on PC can't diagnose you. (You probably know that.) Plus I'm not a mental health professional. So I can't offer you any definitive information with regard to what you are experiencing. That said, I don't believe hatred is generally considered to be a delusion.

I may be wrong about this; but I think hatred is sort-of a manifestation of anger. So, with that thought in mind, here's a link to an article, from PsychCentral's archives, by our host Dr. John Grohol, Psy.D. on the subject of anger management. The article provides links to a number of additional articles related to anger management. Hopefully some of the information in these articles can be of some help:

https://psychcentral.com/anger/

You mentioned there is still one person you truly care about & you're struggling to connect with other people. I take these to be positive signs for you future.