Think about it: virtually every atrocity in the history of humankind was enabled by a populace that turned away from a reality that seemed too painful to face, while virtually every revolution for peace and justice has been made possibly by a group of people who chose to bear witness and demanded that others bear witness as well.
If you try anything, if you try to lose weight, or to improve yourself, or to love, or to make the world a better place, you have already achieved something wonderful, before you even begin. Forget failure. If things don't work out the way you want, hold your head up high and be proud. And try again. And again. And again!