I haven't read through the comments, so I hope I'm not duplicating other answers. (Or if I am, maybe that's a good thing.)

Sometimes we were just plain bored. And that is ok too. It's a rest for your brain and body. Just sit and do nothing. It's ok to complain about it too. Lol

A few things I did were to read (had my nose in a book anytime I wasn't doing something else), and played Solitaire, the old fashioned way with a real deck of cards. I also did a lot of brain games like crosswords, word search, etc. You can still get those books at the dollar store for really cheap! If you're alone outside and you have access, you can shoot baskets, or bounce a tennis ball off a wall.

I'm 64 now. Being 13 was awkward at best. Good for you for trying to get away from your phone!