Same teachers but different outcomes

Sometimes I wonder, why is it that we have the same teachers, yet turn out so differently? I am not talking about the results we get in school, but rather the values passed on to us by our teachers. Is it because of family upbringing? Or the lack of it? The friends we mix with? Because in a way, they are our teachers too (peer learning). The different values we already have when we come under a teacher? Since it is rare that two persons come under the same teachers throughout their schooling years.

Is what we learn shaped/filtered by the values we already hold? Do we choose to learn what we want to learn (filtered by what we already know) rather than what the teacher seeks to impart?