I think it's important to realize that there are things we can control and things beyond our control. Accept yourself for things that cannot be changed (or at least changed instantaneously) and accept that you are growing bit by bit so it's no wonder why we all get frustrated with ourselves from time to time. Oh! And try to remember that there are plenty of great things about yourself. We often are way too hard on ourselves and beat ourselves up when we should focus on lifting our spirits up!