What do you do? Compare yourself with others? Think someone is always better than you? But, you are very wrong. Everyone is unique in their own ways. So you are the best in the form you have.
You need to practice self-love and appreciation. Life is the biggest gift you have. Body is another gift that you also need to appreciate. Think of the good qualities you have. Those qualities will make you fall in love with yourself. Love yourself for what you are. Don't compare with others. We need to criticize ourselves but not in a bad way. We should criticize ourselves when we want to learn from our mistakes.
Appreciate yourself, love yourself and be the best of yourself.