No reassurance is silly. YES, 37lbs is a big deal and you should be very proud of yourself!
I have the same problem with comparing myself to other people and always feeling like what I am doing is not good enough. I do have to tell myself ALOT, that I need to focus more on my blessings and the things I have been fortunate to have experienced and achieved. I do not think that I did things solely on my own.
You have accomplished ALOT and not think of yourself as anything less than spectacular.