What you're feeling is selfishness, not sociopathy, for what it's worth! I don't think a sociopath would wonder what you're wondering here, but I'm no expert.
Not just selfishness... I'd describe it as a healthy amount of selfishness, and the others he's mentioned probably don't have enough.
I think of selfishness and I think of taking deliberate actions to serve ones self at the detriment of others. Things like hoarding limited resources or taking a second slice of cake before everyone has had their first.
I will never forgive you, John. You denied me cake.