Option A) Work 8 hours a day, 5 days a week, for 12 weeks in the summer, for good pay. It's not labour intensive, and generally pretty easy and laid back. However, you've had this job for the past few summers and know that it triggers pretty bad anxiety, plus you won't have internet access for the slow times. This is a family-owned business.
Option B) Try to find another job, which is not guaranteed and will probably have shittier hours/pay. It might help your resume though, and you might make new friends/stop being so hermit-y. Plus it would be something new. Could get scorn from the family though.
Option C) Run away and live with your SO for the summer. You will have a brief escape and, at the moment, have enough funds to do this. It may also get you scorn from the family and it may just make your problems worse, though.