Do not fool yourself into believing that your first articulation of a thesis will be your final one, or that it will be an adequate representation of what you want to say, or of what you have to say. Often thesis statements need to be reformulated several times until they become strong. This is natural for many us. Go back after writing and revise the introduction to convey what the paper is really about. The key to a great thesis and to fulfilling the requirements of the essay is good question.
Life is too short to waste time doing such things.
Find your voice, your questions, and use your writing to learn more about what you what to know. As with the thesis, don't fool yourself into believing the very first question you ask is the best question. These too require thinking and rethinking, articulating and re-articulating, before they are strong and successful. Good writers know that good writing requires re-writing, and always more than one rewrite. Give yourself enough time to do the writing.