I had the opposite experience. I was home schooled from 2nd grade through high school, but I didn't just spend all my time alone with parents. My family was part of a home-school co-op, I played in the local youth symphony, and I had a job working at the local university when I was 16 and taking college classes there. I also have a large extended family.

I didn't really have much trouble adjusting to living on campus at college, and I've never had issues with interpersonal stuff at work or school.

Your anecdote is not universal; neither is mine.