I was picked on horribly in private school and wasn't doing well academically, so my parents pulled me out and homeschooled me starting in 6th grade.
My grades improved considerably. I took my first community college class at 12, passed the high school equivalency exam when I was 15, and entered university as a junior when I was 18.
I spent my high school hanging out with friends from youth group and 4-H and their friends from public school. I used to go to the high school for lunches to hang out with them, and then when the bell rang they'd go to class and I'd wander back over to the college. I'm still VERY good friends with most of the people I knew back then.
I didn't socialize a lot in college but that was mostly because I didn't have a lot of cash and took as many units as I could to graduate as quickly as possible. Met my husband (on here! That does qualify me as weird for sure) when I was in college.
I've made a lot of friends as an adult, get along great with my coworkers and our house is the open-door, come for dinner and a movie type of place.
Homeschooling isn't for everyone but it was totally the best thing I could have done. My parents offered me the option of going to public high school but I didn't take it; I liked the freedom of homeschool/college and didn't feel any lack in my social life.
[edit] My younger sisters were homeschooled K-9th and went into public high school at 10th, and they're doing great socially and average academically. One is really into art, the other is really into comp sci. They are treasurer and webmaster of both the horse club and 4-H that they belong to, do a lot of volunteer work, one is the artist for the school newspaper, the other was just invited to join the robotics team, they swim and dive competitively, etc.