final project proposal 1st page or so rough draft

Space.
An infinite expanse of darkness speckled with millions of stars whose light travels billions of light years and provides little illumination and no warmth.
As I stared out at the vacuum of space, which had been my home for as long as I had been alive, I caught a glimpse of a nearby planet that I had heard about only in stories told by the elder members of our solitary colony. This planet is called Earth, and was mankind’s home planet until we foolishly doomed ourselves to a life of purposelessness among colonies orbiting our past home, never to step foot on what is called “soil” ever again. Although the leaders of the collective colonies still search for a viable home, it is rumored that our fate to float aimlessly through the heavens has been sealed.
I’m nearly 17 years old now, born and bred among the stars, and still have yet to acquire all the knowledge of what brought our race to flee from Mother Earth. Some say our planet was slowly dying, but we humans sped up the process and condemned the only home we have ever know to an early demise. Others say that Earth could no longer provide for us the way she used to and the only option was to abandon her, or stay with her and have mankind die along side her. However, the elders do not like to discuss the matter, and bringing up such a topic is frowned upon. Whenever I approached an elder and questioned what past event brought us to our current predicament, there is always a look of shame upon their face. But this lasts but a second until they scold me for speaking of such a sensitive and dark subject.

This is more or less an intro into my short story. It is a rough draft in that I am constantly thinking of new ways to approach my story and from what point of view to tell it. This is from the point of view of a 17 year old boy named Isaac who lives in a space colony that orbits the past remnants of Earth. Currently, he is trying to find out why humans fled from Earth.
This is just one plotline idea, but regardless of which direction I choose to go in, the main idea will stay the same. The main idea is that mankind doomed itself to flee from Earth. There were numerous advances in nanotechnology, most of which went unchecked due to the fact that scientists had no moral boundaries. It initially began as a humans controlling nanobots to perform complex surgeries, which resulted in a higher success rate and better precision. But eventually, AI was introduced into the nanobots. Now the nanobots performed surgeries without human guidance. Soon enough, the nanobots began to multiply and identify themselves as a separate species. There was somewhat of a rebellion against the humans, as nanobots became self aware and saw no reward in aiding humans, they saw themselves as "slaves" of sorts. Therefore, they set out to eradicate all living organisms so that they would become the dominant "species" on the planet. Humans saw no way of destroying all the nanobots, as they multiplied at extraordinary rates, thus they abandoned Earth for the heavens. They created space colonies which are widely spread apart. They continue to use the nanotechnology at its first stages, where humans control them, because it proves to be the most accurate way to perform surgeries. The main point is that the harms of the technology outweight the benefits, hence the humans leaving Earth, but still using a low form of the tech.
This is just a very rough outline of my story, as I continue to come up with new ideas as I write it.