Some people's "must" is very common, while others are more individual. There is no right or wrong. As for whether this is obsessive-compulsive disorder, it depends on whether your "necessity" has brought trouble to your life. Did it cause you pain? Affect your interpersonal relationship, work and study?
If you feel that "this is good" and "this is ok" and there is no pain, then it is not neurosis. Just a habit.
If you get used to it and it makes you or people around you unbearable and miserable, then it becomes obsessive-compulsive disorder.
As for your question, how to change it? The characteristic of obsessive-compulsive disorder is that the more you want to change, the more you can't change it. Don't deliberately change it.
If you have other things on your mind that make you feel sad, you can consult a professional psychological counselor. I wish you happiness and health!
Understanding psychology: tolerance