Stop comparing yourself to other people. You were created as a very unique and special person. God had a plan for you long before you took your first breath. Relish that thought. Love the fact that you're special. What God has in mind for you isn't the same as for someone else. So you don't have to feel bad that you don't have all the qualities, features, money, or anything else that someone else has. Your journey is just that — yours.
Stop worrying about you all the time. Find a way to be a blessing to someone else. When you change your focus away from yourself, all of a sudden your self-image improves. You get to experience the feeling of satisfaction that only comes when you're a blessing to someone else. Your priorities start changing, and one day you realize that the things that used to make you so jealous and so mad, don't bother you so much anymore.