Yes and I believe I know why my brain reacts that way. I know what "good" feels like, but I also know what it takes to achieve good things. When someone tells me their good stuff I realize that I want it too, but it won't be possible without some degree of hardship and suffering. They remind me of everything that I am lacking, that I want to be, that I need to be.
It is intensified once I learn that they had help (financial or emotional support). It makes me feel like nobody cares whether I am happy or not and then why do I even exist? I am helping other people, but they never help me? I have to work and endure while they get to enjoy?
I wish I was indifferent like others that commented before me. I wish I could just disassociate from the world and myself.