if you like science so much, why not bio? why not physics?
it seems to me that hiv and aids are medical problems, which is more related to bio/biochem than pure chemistry. So why chem?
and why AIDS? it's a rather odd topic to talk about. you've got cancer and all these, but why a sexual disease in particular?
I understand that every one won't make it to the end of the line of go through with the plan if succeeding in this field of study, however I have faith that I can
is that all you've got? faith? is there any plan?
well, your essay feels like a typical answer to the prompt: why this major and why our school. I suggest a path that would link your own story to the major, like telling an episode of your life, an event, that made you realize your passion and please explain what you plan to do instead of saying: i BELIEVE that i'm gonna be great...it's pure arrogance.