How do I develop this idea into something unique?

I have a passion, I just don't know how to express it. I have always wanted to help people. I joined the Key Club at my school but it's a joke, so I quit. I want to ACTUALLY make a difference. I'm only in high school, though. My mom has a 501c3 nonprofit. She told me I could use to create a program. I go to public school and a lot of students come from low-income families and are on free or reduced lunches and can't go to the dances and stuff like that. I've always been fortunate enough to get to do all these things in more. But now I feel like I should help others. My best friend used to be well-off, but then her parents got divorced and her dad is a jerk and stopped paying child support and her mom was laid off last year. She has three older brothers. They had their electricity turned off for over a week before they went to the DCF and got it turned back on, but they are still on food stamps. They might have to move across the country, or even back in with their jerk-ish dad and psycho stepmom. I don't want any of this to happen, but what can I do about it? Anyway, I wanted to start a foundation or something that just raises money to help families and other groups out. Can I even do that if I use the 501c3 nonprofit?