I was talking to a friend the other day and she was saying how happy she is she's learned to love herself and her body thanks to her current relationship.. I was hit with such intense jealousy I don't know what to do with it

I feel so many people I know are so far ahead of me in sorting their lives out.. And I feel like this jealousy is eating me up inside.

My instant gut reaction was to say something mean and try to ruin my friend's happiness, but I don't want to act like that anymore.. I want to learn to deal with my jealousy in ways that won't hurt anyone. Anyone have any ideas or wisdom regarding this?