I have proven to have enough self-control to make several big improvements, for example, my diet no longer includes certain junk foods. On the other hand, I still have some bad habits which need to change ASAP. How do you create good habits and break bad ones, what actually works?
make a list of the bad habits you'll want to do away with, set a means to which you think you can do that and live with it.
First, determine inside of you that you can and will do without them
Second, know for a fact that it's not easy getting rid of a habit, some may take years or lesser, just don't give up at few attempts of trying without seeing results.