You have regrets. We all do. We all make mistakes we are not proud of, whether they were intentional or unintentional. So saying you don't have any regrets is obviously untrue and, quite frankly, egotistical. It is a phrase used based on a belief that, if one does regret something, that person will come off as under-confident or weak even. Maybe it is even said to convince oneself of this more so than others. The phrase can also be used to help people cope with or justify the mistakes they have made. Regardless, to say we do not regret any of our actions is to admit that we are dismissing our mistakes as unimportant, or acknowledging our mistakes as actions that were meant to have the undesired effect that they had, which is absurd. What we mean to say when we say we have no regrets is that we do regret things we have done, but we won't let these setbacks define us. We know that, as much as we may wish for one, there is no reset button in life, and so the most we can ever do is learn from our mistakes and proceed to grow from them.
We have hurt many people throughout our lives. We acted wrongly in situations because we let things get the best of us, and so what? It happens. We're flawed, emotional, empathetic, passionate human beings. We vary in our self control, we are stronger in some moments and weaker in others, and sometimes we just don't think things through. Those are not crimes, and if they are, we pay for them with psychological sentences. I, for one, have hurt so many people and, in turn, so many people have hurt me, but I know I would be lying to myself if I said I have no regrets. I'd be lying if I said I don't regret all the times I lashed out at people because I was going through something, or all the times I walked away from someone who needed me, or all the times I pushed away the people that I love the most, sometimes so far away that they never came back. I'd be lying if I said I don't regret all the times I ended up hurting myself the most. I have many regrets, and I owe it to everyone that I've hurt, myself included, to never say otherwise.
So just remember, when you feel the urge to convince yourself that you have not come to regret anything in your life, fight it, ignore it, do whatever you must do to convince yourself that to regret is to be human. Yes, it's painful. Yes, it's mentally exhausting, but we become better people by being actively conscious of our weakest moments.