One piece of advice is try to keep yourself busy. If you’re focused on achieving something, the negativity goes away. At least for me, if I sit around without doing anything for too long, I start sulking, and that leads to self-pity and envy. Also, if I start feeling jealous towards somebody, I remind myself that if I suddenly switched places with them, I wouldn’t be any happier. I’d still be the same person, just with a different life. If that makes any sense…