i was a bit of a hiki for awhile as a teen. i didnt goto HS or anything, i just stayed in my room and sat on 4chan for years.
for me i think it was that the combination of some unmedicated mental issues i didnt know i had yet, and a bad family situation, had left me barely able to cope with being alive.
on the bright side i got my start with tech/programming/etc with all that free time. thanks /g/ haha