My husband says this all that time, that he doesn't think people like him.
But I know my husband to be sweet, patient, loyal, smart, funny, helpful, strong... I'm going to get annoying if I keep that list going. My point is this - he notices the people who don't like him more than the people who do. You say "the very large majority of people" so I'm taking that to mean there are some people who like you. Try to spend more time around them and take the time to mentally note that these people exist - even if you have to force yourself to do so. Some brains get trained to focus on the negative, but through cognitive repetition, they can start new pathways.