I was some sort of prodigy in almost everything I used to do as a kid

[Darkeningstar]

A prodigy is (usually a child) exceptionally good at something, closely associated with that silly word used for intelligent people... gifted, but sometimes, due to bizarre quirks of nature, is simply precocious

In most cases, a prodigy doesn’t  become a genius, but if you were a prodigy (forgive the repetition), you can be proud of it! It means you are not retarded (at least not severely retarded, retardation in the broad sense seems to be something that belongs to you)