Working full time is definitely a transition from school. What I found was that my social life changed radically. In school, I met up with a new bunch of people every 15 weeks or so just by going to class. Working full time limited that kind of novel interaction to whenever a new person started at work.
I found that having a weekly routine helped. I did my laundry on Sunday evening. I did certain things in the evening of each weeknight. I eventually learned to separate work and personal, and didn't allow them to mingle, so I taught myself to not stress about work during my off hours, and to not take my personal problems into the workplace. (Eventually — it was really quite hard.)
I also found that I had to work harder to maintain friendships. All of my peers had jobs just like me, and a number of them were starting families, as well.
So, work life is different from school life, and it can be bad if you don't like your work or work environment. Even if it's good, it's possible to fall into a rut eventually without the built-in changes that come with school, so that's something to take into consideration, as well.