Yeah, there was a guy at my alma mater (Olin College of Engineering) who entered at 14 or 15. He was perfectly normal and well-adjusted. I mean, it was a weird cloistered tech school environment, so "normal" and "well-adjusted" are relative here, but I also didn't realize he was so young until he mentioned it.

I mean, sure, you get the occasional Ted Kaczynski, but the vast majority of kids I've heard of entering college early seem well-adjusted.