Songs about not letting life's circumstances change you?

I'm a senior in college and my acappella group has a tradition where graduating seniors get to choose a song to sing during their last concert. I'm looking for a song about not letting life's heartbreaks and disappointments, and on the flip side life's great achievements and successes, change who you are fundamentally. Suggestions?

Right now the one that comes to mind is "My Way" by Frank Sinatra, which would also be appropriate since I'm a big Sinatra fan. I have the vocal range for it, but idk if I have the "swag" to pull it off haha.