And what did you gain when you sat around playing Pokemon and watching YouTube all day?

Find something you want to achieve. A long term goal. Could be something like learning to cook the best goddamn lasagna ever, or learning to play an instrument, maybe take some classes on something that interests you. When I was in my 20's I took some boxing classes with a buddy of mine. I'm no George Foreman, but it lead to me taking a few Aikido classes, which I met someone at that I dated for a couple of years.

My point is that going out can lead to many things, but staying home playing games and watching videos likely will not. It may not happen today, maybe it won't lead to anything this week, but the more you go out the more you expose yourself to opportunities to find something or someone that interests you.