Common App Essay Help?

I plan on applying to Cornell University early decision. I know my essay has to be special to set me apart from the many great candidates and their applications. I am having a lot of difficulty choosing a topic to write my essay about. I have considered writing about how I want to work for Doctor’s Without Borders and what inspired me to do so, my time on my school’s swim team and how I am not an athlete, but still stuck with the sport and enjoyed myself, or what I’ve learned in my time participating in band and marching band. I feel like my topics aren’t very unique though. Any suggestions?