You can’t change the past, but you can change how you feel about the it. Do you look back at an event that happened in your life and feel bad? Do you feel like you were the victim in that situation? Or, do you reflect on that event and say that you needed that to happen? That because of that event, you are who you are today. You overcame something and are a better person for it.
You probably didn’t realize how good you have it today, and even though it was difficult previously, so many people still have it so much worse than we do. Not only that, but so many people before us had it worse than us, yet they were able to overcome it and do great things.
Don’t let the past limit what you can do in the future. Use those events as steppingstones to get you to where you want to go.