My plans for staying sane are falling apart, got any suggestions?

It's summer, and I'm on break from school. Problem is, if I spend too much time on my computer, I get really irritated and irrational. My real friend group is exactly one person(plus school friends and internet), and they aren't exactly free all the time. I was going to volunteer at my local shelter to cuddle cats, but the minimum commitment is six months, and my family has some loose plans for later in the summer, so that does not work. I know this probably sounds like pinnacle of all first world problems, but I really, REALLY need something to do this summer. Sorry if this sounds like a weird form of bragging, or if the title made this sound more serious than it is. ** TL;DR: Lots of computer and no sunshine makes boxesofboxes a mean girl. Ideas, please.**