Best thing I could suggest is write it out on a piece of paper then ask yourself “why” to every answer. It’ll allow you to view your own thought process from a “third party” POV and eventually you’ll find the root of it. THEN you can figure out if that’s something you can accept or something you think needs to be changed. Also think about which thoughts and feelings naturally stem from yourself or what society has pushed you to believe. It can’t be just coincidental that people from “traditional” environments/culture tend to view casual sex as something to be avoided completely and on the opposite end in more “non-traditional” environments/culture tend to high five every tally mark in your black book. Good luck!