Confusion is the enemy of progress. Make sure that you are well researched and know what you're getting yourself into.
They say that it takes eight times to learn a new habit and twenty-eight times to unlearn an old habit. You need to be persistent. Without repetition, a positive new habit won't stick; it will fade away and you'll fall back into your old habit. Even more interesting is the fact that old habits are difficult to break. If you truly want to deprogram your old habit, you'll need to replace it with a new one and spend the next 28 days repeating it until it takes over. It's not easy, but it's an effective method and potentially very rewarding.
No, you don't have to. So don't panic. You're an adult; you can say no or pass.