Hello,
Thanks for sharing your profile and self-assesment. Putting in time doing some self-reflection will only benefit you, and it sounds like you've done some of that here. I agree with your assessment in that your extensviely international background, and your extracurricular and community activities, are where you can and should stand out. The mentoring organization sounds quite interesting to expand upon! And with regard to your international experiences, try not to take those for granted but really reflect on how those experiences have shaped who you are today, perhaps in a way that will enhance your contribution to a give school.
It sounds like you'd be a great candidate for schools such as Duke, Darden, Cornell, Ross. You could add some top 10/15 options as well for reach choices, but I'd only do 1-2 of those. And for the VERY top as in GSB/HBS, you'd really want a higher GMAT for sure, and still a reach for most even with that.
Let us know what other q's you have! Best wishes.