Life is about having a vision of the person you want to be and then spending every minute being that person.
It sounds like you have made the decision not to be a drug addict.
Sometimes ( this may sound weird) creating a physical version of the way you want your life helps to stay focused and bring into being the life you want.
Create a mood board. Cut out pictures of the way you want to look, the job you want to do, the house you want to create etc etc stick them together and display it where you can inspire yourself every day to stay on track.
Involve your mum to give you strength thru the dark times, and be forgiving to yourself.
If you read, there are some brilliant motivational books about taking control and creating the life you want. The ones that changed my life are "The Power of Now" Ecthart Tolle and "Conversations with Good" by Neale Donald Walsch.
( Ignore the title, I'm not some mad Christian fanatic 😂)
But both books will pull you out of your conditioned way of thinking and give you a new fresh approach to life. Best couple of pounds I've ever spent on eBay. Good luck ❤️