Take a good look at yourself without any makeup, without dressing up for a special night out. Look at the natural you, with no embelishments. Smile at yourself. Brush your teeth. Brush your hair. What do you see? Spend a good ten minutes or so on this. Feel out what you really think of yourself. If there was no one else in this world? In other words, don't think of what you think someone else thinks of you.
Your answers will vary based on attitude and self perception. Do keep it positive. You're worth all your positive thoughts.
Pick out all the possitive things you notice. Throw away all the negative things you THINK you notice. This is your starting point.