I feel as if nothing works

At just 17 I feel as if I've procrastinated my whole life. As a kid I was smart in school so never did my homework and wld study a day before the exam and get good grades. I've not even had any hobbies I sticked with. I'm in 11th grade and these three high-school years I've procrastinated, too. I got good grades but not extraordinary ones, and I think of it everyday how I wasted my potential.

I dont even know why I procrastinate so much. I've so many goals so much I wanna accomplish, and yet I don't do anything. I'm supposed to apply for colleges/uni this year, and I've no ecs.

I've only this one path in front of me that cld get me at a good college, but it's hard. I daydream about getting it done but subconsciously I know my indiscipline will fail me again.

I want to get disciplined for once and all. How much time would it take? I'm willing to try my best this time.