Saying sorry aint never been easy for me...especially when am wrong. However it is the best thing that you can do to appease yourself and to remove that weight of guilt that bears a very burden on someone.
Personally, I apologize where I can but I have to admit, sometimes my ego gets the best of me and I don't apologize when am wrong. When this happens, I literally get nightmares just from thinking about the person I wronged.
Guess what am trying to say is that the best thing to do is not usually the easiest option but worth it nonetheless.
Good question by the way. I give myself a 5