You have to be true to yourself, but you have to be true to your best self, not to the self that secretly thinks you are better than other people.
Nothing is sillier than this charge of plagiarism. There is no sixth commandment in art. The poet dare help himself wherever he lists, wherever he finds material suited to his work. He may even appropriate entire columns with their carved capitals, if the temple he thus supports be a beautiful one. Goethe understood this very well, and so did Shakespeare before him.