"I'm so angry!" - a familiar litany? How do you get rid of resentment? Read on.

[edit] Steps

Understand. Understand why you're so resentful. Does the person you're resentful towards have something you don't? Are they prettier than you?
Love yourself. You have to love yourself the way you are. If you really envy that girl with bottle blonde hair and the hottest guy around, then take a good look in the mirror. You are beautiful too!
Look at the flaws. Sure, she might have a hot guy, but if she isn't good at math and you are ... well, that's something in your favour.

[edit] Tips

Don't get overly critical of people. It's fine to think of the flaws, but never say them aloud. You'll just sound snobby and it won't do you any favours.