I managed to develop a *habit* of not going out and socializing with my friends. I was simply going through a phase of disappointment, and frankly, I did have better things to do in my life. But during that time, it kind of "grew into" me, and I developed a huge amount of unnecessary unsecurity and fear/anxiety about trivial things, such as simply going out and having a few beers. Now it's getting better, since I perceived it, analyzed it, and decided to change it.
The point is - one needs to move, and I'm referring to the most general meaning of that verb.