Never Do A Mistake/Habit Like This

For the past year, I have been making very bad mistakes and making more habits. If you don't know what a habit is, it is something you keep on doing a lot. During school, I always plan on what I am going to be doing when I get home. I plan to do what homework to start and when. Turns out, the plans never worked out. I try to keep the plans simple, but I always change it when i get home. I always say to my parents "I am going to do my homework in 30 minutes!" Well, that 30 minutes passed and I was still playing some games on the computer. I thought to myself "Ehh, homework. big deal. i can finish it in like 30 minutes!" I kept on saying that and saying and and saying that. Then it was 6:00 I finally decided to start my homework. Turns out, the choices I made were bad. Then, it turned into a habit. I started doing my homework at like 5-6:00 every single school day. I always finish at like 9:00 which is way more then 30 minutes, more like 3 hours. I always got yelled at and soon I started never doing my homework and got yelled at more for missing assignments. Today, i want to make the right decision and do my homework on time and do it fully. I hope this really works out because I always said that, then never did what I planned like I said before. Just one little tip: Never Do A Mistake/Habit Like This. EVER. And if you already are doing this, then I recommend stop like I'm trying to do. this is like smoking and getting addicted and can't stopping. I have made some really bad decisions lately, and hope not to do it again.