How do I stop envy and low self-esteem?

Whenever I see someone having a better life than me I feel like a piece of shit who never did anything valuable

Last time I've seen my ex with her new bf I was so fucking envious that after coming back home I got so mad that I started punching walls

It's hard to live when you feel like you've inferior to everyone.

And I'm not really that much of a loser - I live alone in a big city, I have a well paid job and a close group of friends. But I feel incomplete, I feel like I had to do something more than everyone else

There's the second problem - I'm extremely scared being forgotten after death. I envy historical characters, I envy men who were so important that everyone knows who they are

Just help, please