From my High school years, I've had to face some experiences an obstacles that required a more complex thought process to overcome.
.... ....This is what I suggest;
From my high school days, I have been facing many challenges and obstacles that demanded intelligent decisions and a strong determination to overcome those hardships.It wasn't easy for me as i have given up open myself quite a few times, but as time went on i knew that everyone makes mistakes, including me so i quickly got back on my feet and tried again.
.... I feel it is better if you tell them one such incident and discuss it to show how you overcame it. That would open a window for them to see your real personality.
The biggest accomplishment i would have is being the first out of all my relatives to make it into college.
.... a good point. Wish you gave a little bit more emphasis on it.