I really don't know what "reaching your full potential". I always thought of it was some meaningless idiom that Js recite as they waggle their fingers. I did, however have an experience in 11th grade that gave me the only working definition I have for the general sentiment.
I went to an "alternative" school for the arts, and we had a kind of home-room teacher who was in charge of tracking our cumulative school progress. Twice each year we had parent-teacher conferences that we (the almost adult student) were supposed to conduct to explain our academic and creative progress to our parents. I suppose the teachers were there mostly to keep us honest and chime in when they felt like it. So I was explaining that I had done pretty well with an impressive B+ average, and he decided to interrupt. He went through course by course, section by section and asked me to explain why I got the grade I got. My explanations (I'm not one for excuses) were that I did most of the work, I followed most of the criteria, I studied for most of the test. Each time I said the words "most", "part", "some", etc, he wrote them down. In the end I think I had about 35 of them.
Then he and my mother had a very pleasant conversation in front of me about how much I could have accomplished if all of the "mosts" were "alls".
They didn't realize how lucky they were to get the "mosts".