Well here is the thing.
You believe you can't control it. And to try and fix that, you think locking yourself away from it, and the 'challenge' of self-control will help. I'm sure it will help, until that block is gone.
What you need to do, is plan to remember 'how you feel' when you engage with self-control. Write it down. Observe the truth. See the truth. Likewise, write down how you feel when you lose self-control. I'm sure comparing the two you will see one is better than the other. But not just that, that it is possible. When you realise, feeling good was way better than not feeling good, then you are more able to not control the habit, but form a new and more healthy habit.
Every time you engage with self-control, you are learning self-control. Faith keeps you going in that sense. I believe you can do it, all you have to do is start. And if you fail, start again, keep going, keep standing up. You can get there.