I'm an only child and had plenty of adult interactions outside of public school. If I was homeschooled I would have been miserable, even if I met people through sports and other activities.
This site is filled with introverted engineers -- not exactly a representative sample. 3.4% of kids are homeschooled, 64% of which are doing so in order to provide religious instruction.
And I have no reason to doubt you. Homeschooling definitely isn't for everyone... but that is not the same as saying that homeschooling is across-the-board inferior to public schooling. Public schooling also isn't for everyone.
This site is filled with introverted engineers -- not exactly a representative sample. 3.4% of kids are homeschooled, 64% of which are doing so in order to provide religious instruction.