Why does Nat want to escape the questions about his parents?

From the text:

And I was off, escaping, the way you always have to escape sooner or later if you don't want to be clucked over and sympathized with and have to listen to all that mush, or, worse, have to answer the next question and the next and the next. If you have to answer questions every time, how are you ever going to learn to forget?