Quick, think of three things that are good about yourself. Remind yourself of these things all day today, at every given opportunity. Go ahead, give yourself some compliments (even though it may be hard at first).
If you need prompting, chose three descriptions from this list that apply to you: sincere, prompt, truthful, caring, attentive, smart, good hair, beautiful blue (or brown or green) eyes, precise, diligent, great sense of humor, peaceful, patient, proud, friendly, fastidious, childlike, poetic, hard-working, tall, sweet, creative, neighborly, green-thumb, witty, resourceful, good cook...That's only a starter list of possibilities!
It's way too easy to be self-critical, and hard on oneself.