You don't live a life without regrets if you truly live the human experience, but it just so happens that I have a lot.
I've been a pretty bad friend to good people in the past, I've had substance abuse and self-harm issues, and I've been violent with people over comparatively meaningless bullshit like - for instance - money. Although I did have people in my life who didn't abuse me growing up, I had some people who did, and that put together with the environment I was brought up in and my inherited mental issues fucked me in the head pretty good. But I don't allow it to be an excuse, anymore.
I am lucky enough to have found peace and forgiveness from both the people I hurt and from myself. I'm getting a little better with each passing day, and I pray that becoming a better person is penance enough for redemption.