It sounds like you have not practiced discipline, it's not innate. Luckily life is the perfect teacher. Take up a hobby for purpose of being disciplined. For

It sounds like you have not practiced discipline, it's not innate. Luckily life is the perfect teacher. Take up a hobby for purpose of being disciplined. For me it used to be weight lifting, then wood working, now music. Make a realistic schedule and set of objectives. Then execute. You can only modify your plan rarely.