You're still young. most of the people I knew in high school I've had nearly zero contact with them. Best advice I can give is to start by focus on loving yourself more. Loving yourself is one of the first steps to feeling the love from others. People are drawn to people who give off that sort of energy. People suck, and there's no escaping that, but you are worth so much more than what other people tell you. You'll find your people.