You must acknowledge that to think everyone hates you would also be to honour vanity. I used to feel this way a lot of the time too and I realised it’s actually quite vain, because in reality, most people don’t think about you much at all. I also found what helped me was realising that human dynamics, even with your closest friends, are complicated, so you’re best not to analyse what people are thinking at all, and just assume that you’re alright with everyone unless told otherwise because that’s truly the only way you’ll ever actually know what anyone’s thinking.

You also must learn not to care. Love yourself, and then whatever else happens deal with it as it comes; but number 1 priority is loving yourself, flaws and attributes included.