Vonnegut means when he says that he is a ""real person" is that some people damage his reputation by saying that his writing are fictitious and damage for the mind of student.
Explanation:
Charles McCarthy, the head of the school board has decided to burn all books of Vonnegut because he assumes that the lesson taught to the children has inappropriate language. For this reason, Vonnegut wrote a letter to the Charles McCarthy, who was the head of the school board in order to explain that the lessons wrote by him has no appropriate language or any evil ideas which damage the character and mind of the student.
