I agree.. sometimes some people are surrounded by negativity and darkness...in those moments, they have to choose to be happy and choose to be a beacon for others to follow...
I've been through a lot of trouble growing up, as most people do, and when someone asks me how I am still happy I always tell them that happiness is a choice, in the same way being sad is also a choice.. if you wanna live longer you've gotta live happier.. surrounding yourself with positive people is one of the best ways to do it :) for me prayer helps too :)