I am very grateful I still have my Dad. My parents were still teens when I was born. However I am recently a new father myself but I am much older. If I die at 70 they'll be in their early 20s too. Wow, I don't even want to think down that line.
I applaud you on your life affirmation! I will let you in on a secret. At some point you will slip up, not follow through on something, have doubts, whatever. It will happen and guess what? You're okay. The best thing is not to beat yourself up over it. You can do it, whatever it was it was just a pause, an aberration, a small skip in a much bigger overall plan to better yourself.
Just keep your short term goals doable and your long term goals out of reach. You might surprise yourself how many short term successes can lead to things you never thought possible for yourself. Even a long term goal will be reachable if you don't quit on yourself.
I've done some amazing things, not always successfully either. And in some ways the failures were better outcomes.
So good luck and it sounds like you have plenty of people here to cheer you on.