No-one else could (or should) write your essay for you in your own style with your own research. Whether you would be able to write the same essay to the same standards without some appropriate essay assistance is a different matter. Your thoughts and opinions are your own but words and their accurate use are common to everybody. At the end of the day you should have pride in your essay. It is what represents you and you alone.
As an essay writer your main task is to research and develop a coherent argument within the quite formal structure of an essay. Grammar spelling and punctuation are extremely important when writing an essay on a subject which calls for good language skills - English Literature for example. However an essay on other subjects also needs to adhere to similar grammatical standards. The rules of grammar exist for a positive purpose such as ease of communication and to avoid ambiguity not simply for some arcane reason lost in the mists of time.
Talk to your high school counselor or your college adviser. They can give you some essay examples and you can have them proofread your essay once you are done writing it these professionals will have insight into what the admissions officers are looking for in an essay. And it is always a good idea to have one or two people read over your finished essay in order to make sure there are no grammatical errors.