Initially, yes. But there are two key points. First of all, we are not truly molded. Even as young children, even before we can speak, we are making choices that become habits. But our choices are limited to imitation or reaction to what we see around us.
As we grow, if we are open, we discover, literally, a world of possibilities. Then it is time to reshape ourselves. Stephen Covey calls in rescripting - rewriting the scripts of our conditioning. If we've been molded, though, we may have to completely melt ourselves down to re-form ourselves into the people we want to be.
Stephen Levine calls this work of spiritual transformation "the healing we were born for."