I think there's a little irony in your post about the fruitlessness of doing something for the sake of doing something. You point out that playing video games is a waste of time you will be regretful of later in life, and (presumably) you should be doing something more fulfilling.

The problem with that is at some point you will stop doing and being. You will be dead and none of it will matter. You aren't saving up fulfilling memories for some eternal day of reflection(Wouldn't that be a drag if that's all an afterlife consisted of). You are being and dying then dead. The playing the video games was part of the being all along.

"We need to understand why something is happening..." all of that stuff is the doing something for the sake of doing something because you haven't accepted that you will die. Or that's also part of the being. Nothing to get upset about, unless you want that to be part of the being too. In which case, be as upset as you want.