@MidwestDad3 @Hunt Thank you all for your opinions 
I understand how difficult the topic will be. I’m just afraid that speaking solely on my organization is too impersonal because many other essays are already about glowing achievements and helping poor people and being all magnanimous. I’'m afraid my essay will lost in those seas of people because it is too objective and sounds boring like an advertisement of my organization. Plus, the question on Qustbridge has a part that says:
“Please describe the factors and challenges that have most shaped your personal life and aspirations.”
So I want to write about the psychological challenges of learning to live again after an incident that happened in my past. Wouldn’t that be more compelling? Because honestly it affects my life for many years and that is the only biggest challenge I face. I could conjure up some other challenges but honestly they all sound so pale in comparison and they are really easily overcome so I don’t think I can’t write well and emotional on them.
And also, I just found out another thread like mine: http://talk.collegeconfidential.com/parents-forum/576108-sexual-abuse-p1.html
And in that thread another girl also encountered sexual assault and she also run a charity organization and a lot of people encourage her to write about her experience, so I’m still very hesistant on whether to include my past in it because people say she should include her past in. But again, thanks for all of your comment and opinion. I’m glad to know that some people are willing to listen to my stories.