What are some things to do when you're bored at home alone and 13 years old?

What are some things to do when you're bored at home alone and 13 years old?
Is it possible to have a friend over? Try learning a musical instrument. There is always reading, walking or hiking if you are free to go out, take part in some household chores-- I know, but when you are bored and you allow yourself to 'get into' something, it can be rewarding. Take care of a pet-- or get one if you don't have one. Study, computer, television...