What would you like people to say at your eulogy? What will they say? Most of us find it hard to be objective and see ourselves as others do. Think about it. Write your ideal obituary. Now look at it. Is that who you really are? If so, good for you; if not, how can you live up to how you want people to remember you. Start now. Take one thing at a time and change it. Trying to change everything at once isn’t always possible, so pick the most important behavior or attitude you want to change and create a plan. Give yourself a few days to come up with the plan; change it, refine it, add to it, delete from it; but set a time limit. It would be very easy to just keep changing the plan and never implementing it. Once you put the plan into motion, you can refine it, but follow it. Give yourself 3 weeks to change. Once you have changed that first characteristic, start working on the next one. You may find that changing just one thing will trigger changes in other areas of your life, and some of those things you want to change will change on their own.
Let me know how it goes for you.