Are there community groups in your area for high schoolers? The summer is here and I believe a great opportunity to see what activities for similar age students are available to you. I know home schooling does rather isolate families, but it doesn't have to be that way. Search online for public groups that facilitate interaction for home school students. Get some information about them and see what resonates with you, whether it's sports related, theater/acting (I might do something like this myself again), dance, exercise, theme park field trips, etc. You can do it. I believe in you. Baby steps, babiicakies.

. Good luck.