I'm jealous of my boyfriend's best friend who is a girl.
What makes you feel jealous of her?
She has a nice car and a salary that makes her independent
Feeling jealous of others who are doing better is natural from time to time.  However, feeling it constantly or letting it control you is bad.  Don't feel so down on yourself, you're doing great!
Whenever I see her I feel miserable, she deserves nothing
I'm sure she deserves something if she works hard and contributes to society. It's best to let it go before the jealously eats you up.