I also think that not feeling like I'm "doing enough" or that I "am enough" (inadequacy) is a symptom of fear and old tapes. Although I have worked hard, studied, and have wonderful experience of my own in education, comparing myself to PhDs and people with 10-20 years in the field is not an approach that lends itself to me feeling like I know what I'm doing --ha!
The solution has been to remind myself that I was hired out of a pool of hundreds or thousands of very-qualified people, that I have a wealth of knowledge, am a great teacher, I love learning and sharing what I learn, and that my core values are in EXACT alignment of our school's! In that light, I am THE PERFECT FIT! And thus, why am I surprised to get positive feedback on my efforts? Ha!
In knowing that I am doing well, I am inspired to continue rather than coast. I wish to learn more and continue to improve in areas that are a challenge, or in areas where I lack experience. And the wonderful part of it all is that I am very confident in my abilities to do both!
However, I am still so grateful to receive affirmation that I "am enough", have been "doing enough", and that I am doing well as a Mentor at my school! Yay!