>Stop reading reddit and this sub in particular. It's overwhelmingly full of pessimists

Excellent advice!

>This is the best time in history.

This is the best time in history ... SO FAR.

>No, it's not perfect, but the past was a LOT worse. Read some optimistic stuff

Very true! But you don't even have to read optimistic stuff. Just read neutral stuff, i.e. "just the facts". You'll soon learn that, in most parts of the world, this really is a great time to be alive. It's not perfect anywhere, but in most places, it's WAY better than in the past. And the future looks like it'll be even better.