Oh boy....How can I say this the way I would like it understood?.......I'll just say it and YOU take it anyway you choose........
That intro should give you a hint at what I'm about to tell you. Kierstin. YOU are really good at something if it is something you love to do and get much enjoyment doing. You are good at it if YOU are satisfied with the outcome/results and realize it has value. YOU are good at something if it works out for you more often than not and you feel victorious and grateful
No......lack of comment, praise or kudos is NOT the simple answer, as you ask in your question. Nor, by the way, can you believe you are "good at something" based upon positive feedback and continual praise.
It's all relative.....taking into consideration we are dealing with sane individuals......(eg. Charles Manson thought he was good at preaching and caring for his followers....some of them may have thought so too....but due to the insanity involved here, all opinions are moot! Period)
This is true: If you keep doing what you love and YOU believe you are GOOD at it......in time, you will see that your own belief in yourself, spreads to all around you. I promise.