How do I stop being envious?

Turn it into a force for good.

Let it fuel your own ambitions. Want that fancy car? Then work harder, go to school, ask for a raise, etc.

And also use it as a force for introspection.

Do you really want or need that fancy car? Really?

Look at its true cost. Fancy cars come with fancy payment plans and fancy repair costs. Sports cars in particular may be stopped for speeding more often. Can you afford tickets and more expensive insurance, or to spend time and money defending yourself in court?

If you can't, then your friends probably can't, either. That thing you're oh so envious of just might be an albatross around their necks.

You lucky bugger!

You escaped the 'MACHINE'.

Have a Lovely Day

You need to change your outlook on life.
Because all the problems are in your head.
I had a period when it seemed to me that everything in life was terrible, that I was haunted only by problems, there was nothing good, there was no future, no prospects.
I was annoyed by everyone around me because I thought they had a good job, a good family, and in general, their life was better than mine.
At some point, I got tired of that situation and I decided to change something in my life. I found a new job, an interesting hobby, started to meet more friends. And although my life has not changed dramatically, I have become happier.