Inudzuka, you innocent one.
Once you enter the work force, unless if your job allows you good hours, most of your free time will be focused on resting. I guess that's fine for an extrovert to have weekends be always hanging out but your body will still need physical rest. As someone who's joined the workforce thinking me and my HS classmates can just "hang out" whenever we want, there's a degree of difficulty in that. Planning eventually becomes essential and even then, rain checks can happen.