Among the biggest issues any writer will want to discuss at length, censorship and free expression are near the top of the list. In many countries, governments have made constitutions to protect peoples right to express themselves freely. Unfortunately, although people have had to fight battles to keep their work from being censored by society, probably the biggest censor is not society in general, but the writer his or herself. Whatever the writing, it is important it not be whitewashed by the fear of failure, or that the writing will be controversial or ill-received. Poor writing steps lightly into its content.
Censorship occurs in many different forms.
Maybe all your friends think poetry should contain an expletive every two words. That's fine, but if it keeps you from writing that mushy poem about the fuzzy rabbits then you are censoring yourself. Fulfill your poem with your own thoughts and ideas. You are already influenced greatly by people you meet, items you read, and things you see around you. You should not allow any influence to change what is, to a degree, a reflection of yourself.