¿If you could change something on your life, what would it be?

I've always wanted to go back to my past and change my decision so that i can avoid my broken heart that turn me down. But after a long thoughts I change my mind and never wish that I could go back to my past again. That broken heart eventhough its hurt had make me stronger and mature, makes me more careful and understand about other feeling. So now I dont want to change it back. Eventhough I have a chance to do that. I will rather use it to go back to the past and warn people about Tsunamithat happened 2 years ago so that no people will die or suffer because of that disaster