when we can't go back to the future

Remember on Back to the Future where going back to the past and changing even one small event set a new course for the future? It makes me wish we could really experience time travel. Sometimes I have moments that I wish I could change.
I hate regret. Examining what I should have said or what I should have done. Knowing that if I could relive the moment, things would be different. But I can't go back to change the future. Instead, I have to hope that things really do happen for a reason. Perhaps fate really does exist. And if not, live and learn.