1. Stop comparing yourself to other people.
2. Don’t put yourself down.
3. Get into the habit of thinking and saying positive things about yourself to yourself.
4. Accept compliments.
5. Use self-help books and websites to help you change your beliefs.
6. Spend time with positive supportive people.
7. Acknowledge your positive qualities and things you are good at.
8. Be assertive, don’t allow people to treat you with a lack of respect.
9. Be helpful and considerate to others.
10. Engage in work and hobbies that you enjoy.

(Source: mind.org.uk)