I certainly was never inspired by the vast majority of professors in my undergrad or grad experiences. The only prof who has ever really inspired me was my PhD advisor. However, nurture is just not the word I’d use. He said something to the affect that you needed to stick you head out there with the understanding that you would be beat down, and you needed to learn to defend your ideas and ambitions.
Personally, I think you need to reflect on experiences on your own and not care how others believe you should feel. This has helped me form my own agenda. Sometimes the worst thing you can possibly do is listen to others. I guess you need to listen selectively.