How to be happy?

I’ve been going thru a lot recently, and I feel like I’ve lost myself. I feel unhappy, and sad, just not like myself. I have a hard time enjoying the small things in life and idk how to overcome this. I see some people can be happy no matter what they go thru or atleast they surely act like they can. I just want to be happy without worrying about my troubles every time my mind is free and even when it’s not.