What to write about?

Who has ever had to write a paper and didn't have a clue what to write about? Have you ever tried to just start writing a paper and it took you forever to get to a starting point? I have had these problems. I try to just think of things that relate to me and just base my paper off what I know. There are a bunch of ways to start a paper. 

There is freewriting, cubing, questioning, outlining, letter writing, and discovery drafting. For me, freewritting and outlining are the best things for me to generate ideas for papers. I just start to write and then whatever I write about is what my paper will be about.