Welp, if you's offended I assumed you to be a dude, my apologies. Though really, (@everyone), seems silly to worry about gender on the internet.
I thought I was doing so well yet apparently not. Everything's pointless and sucks, now disregard this post.
I'm going to disappoint you by bringing your post back up.
Mmm, it only feels like a waste because you've convinced yourself, (or been convinced by popular culture), that those activities are wasteful. I contend they're about as wasteful as reading a book, (though it depends on the game...some are like reading children's books), which really isn't very wasteful at all. You get cultured, and learn knowledge 'bout tons of things, and it's ridiculous when you run into people that just don't know things you've known for ages because you were exposed to it through this interactive medium.
Not everything's going to have a concrete product, nor should it have, and you should stop measuring your actions in your own damn free time against society's arbitrary expectations. Which, btw, are (again) a construct of your own perceptions.
Also: if you really want to change, start making an effort to recognize when you're partaking in behaviors you want to change, and then interrupt them. Keep the practice up, and voila, you've changed your behavior.