Hard to pinpoint exact symptoms but I know around puberty is when things started to fall apart for me. I was always a strange kid, but things got worse when puberty kicked in. I was also an early developer. (Bra at 10, first period at 11).

I would go days with out hardly sleeping or I would stay up until 3 or 4 every night. I would (and still do) hold conversations with my self of others (not imaginary, just playing out loud what most people keep in their head).

One night for no explainable reason I went around and took all the phones off the hook. I would get lost in a made up world in my head and spent more time in fantasy than in reality (this was decades before the 'net).

I would stay up all night and read out loud or rearrange my room. I drove like a maniac at times (in high school, I am a farmer's daughter who started driving at 14) with no sense of my own mortality.

I would spend entire weekends without ever leaving my bedroom, except to use bathroom or eat .