I have lost both of my parents, one to cancer and the other to a lung disease.

Make the best of the time you have left. You may regret your past, but it's the past and you can't change it and you don't want to spend the time you have left with her dwelling on the time you missed out on.

I watched a movie today, and there was a conversation about grief. The comment that was made on the movie was basically "You have to decide if you are going to spend your time being angry for the time you didn't have with her, or thankful for the time you did". This really hit home for me.

Try to focus on the good things. It will be a hard road, but make the best of it while you can