I always felt different and thought of things others didn't. Socially it was difficult because looking back I can see episodes of mania that were taken for tantrums or eccentric behavior where people thought it was a typical kid looking for attention. Then I would get sad at the reaction from people and didn't want to be around anyone for days. Mental Illness was in it's infancy so no it wasn't noticed or treated unless you were considered bat shit crazy and institutionalized. You just dealt with it.
