I agree with those that say to write it and see how it goes. I also agree that while it is something very personal to you, it is not necessarily a unique topic because it is just another spin on overcoming obstacles. That doesn’t necessarily make it a bad topic, but it has the potential to be cliche. You may also find when schools put up their 2018-19 essay prompts that this essay works better as a supplemental, so even if it doesn’t end up being your Common App essay, it still may be worth the effort. My son spent the better part of the summer perfecting his Common App essay, and then when it came down to it he decided it just wasn’t working as his main essay, but made a great supplement essay to the prompts of at least 3 schools he was applying to. You’ll need several different essays so definitely work on this one while exploring other ideas as well.