How to be happy in a Situation you unhappy with or don't like to be?

Right now, I'm in a situation I don't like being in. And I won't be able to change it anytime soon. There is even a change some things might never change at all.

How do you deal with that the right way? How do you learn to be okay with where you are? How do you find happiness, or atleast peace, when you don't like your current life, and you're not sure that some things will ever be different?

I feel like these questions don't just apply to me. There are probably a lot of people out there who are stuck in Situations they don't like but can't immediatly change. Many of them have it probably a lot worse than i do. So i feel like these questions are for everyone who feels the same, in their own way.