How to be comfortable no matter the circumstances and conditions: - Practice discomfort: And no that doesn't mean hurt yourself. It simply means try to get as much as you can out of your comfort zone and confront situations of that make you uncomfortable.
Nobody owes you anything; you owe the world everything. This is something I learned when I was a young boy. Change your mindset from "why me?" to "why not me?" And embrace the mindset of "how can I leave the world in a better situation?"