Faced with a blank page does your brain feel just as bare? Writing has two different processes that at times seem to be in conflict. There is the creative side and there is the analytical side. While both are necessary it is important to be mindful of allowing a certain separateness. Yes, structure is important, but your voice and creativity give your writing life. Freewriting is a great tool for releasing the creative side.
Before you begin that essay or paper give yourself 10 to 15 minutes to start a flow of ideas. I like the idea of using a pen and paper, but this works with a keyboard too. Set a timer for 10 minutes and just start writing. There is only one rule: keep writing until the time is up. Any subject, any thought, no grammar check, no spelling correction, fragments allowed. You do not need to stay on topic or have any order. Just write. If you do have a topic that you need to explore for an assignment, use this as a way to tap into your opinions and feelings. Organization can come a little later. Finding those ideas gives you your real start.