You are enough. You always were enough. You were born enough. No limiting belief or feeling you have diminishes the fact you are enough. No one else gets to say you are not enough. There is nothing that can change how whole and complete and enough you are. Even if you don't emotionally feel that truth, start by practising intellectual acceptance of this.
The Moody’s Foundation’s Take on Philanthropy: Lets Perplex Our Nation’s Math Students