Sounds like your in a small dark place feeling guilty all the time, and looking around and all the stuff you don't have.
Learning to live a life well is a skill that can take a lifetime to master. The people you are comparing yourself to make it look quite easy but its all a positive filter bubble on facebook and society in the end anyways.
You may have to rewrite your own thinking, beliefs and the very core of yourself in order to put depression in its place. I know I did. If you have people and thoughts making you feel like shit all the time, don't be afraid to dump them.
If you need to start somewhere, practice mindfulness, stoicism and critical thinking to have a basis of self to build on. Use pot edibles for instantaneous feelings of joy if you lack any in your life.
Enjoy the journey, and good luck OP.