Welcome to professional adulthood.
I wish i had some more comforting advice but the best i can do is wish you good luck. You will need it.
Just know that no matter how long it takes it is saying nothing of you value! You are a valid and valuable person.
I am not sure about “the need to build knowledge” but i am liking the idea of communities of specific interest and expertise with the idea anyone can go discuss things with experts.