I would pass to you the same advice I have given several other friends who were at the end of their lives. Some young, some old, but the advice remained the same.
List the most important people in your life. Put them in order. Write a letter to each one explaining why they are important to you. In that letter, ask for their forgiveness for any hurt or harm you may have caused. Ask a friend to mail them the day you die.
Very good advice.
Add Thank them for the ways they have made your life better.