I Am Sorry

I recently read a story about people interviewed while on their death beds.
Do they have any regret now that their book is slowly closing
The common regret was being sorry for choices they wish were different. Regret for challenges they were afraid to make. Traveling, better decisions, making more friends and supporting family better and so on.
I could alter the list. It's not a wall of agreeable regrets held by all.
Regrets I feel are real but not necessarily anything more than just being human. We all did the best we could do. We all deal with apprehension and fear. We have heavy choices. Life is hard. Driving across the State can make us regret that we didn't use a map or maybe we should have turned left at the last sign.
But I too, I guess, have a regret. One where I feel that I must say, "I am sorry."
I am not sure why but I feel I must take responsibility.
Is it real?
How much time do we use to struggle with an I should of or could of or why didn't I?
This is a common human experience. After a brain injury, I have read and seen and experienced how much the common human experience is accelerated. A hump on our back where we feel laden with too heavy a burden. Wishing we acted differently. Thinking that our emotions/feelings now create more regret than a rational plan for action instead of regret and/or apology.
It's not easy being me right now. Or for you being you! In trying to paddle down a high rapid river practicing at control and not only emotion aids in finding shore.
I want us to be patient with ourselves but work hard. Thoughts and emotions of negative quality can be lessened, with practice.
It's not easy. Some days are just the days that they are. A day of walking close to tears. One of feeling angry. It is not us!
So, what can we do?