I am a person who works very, very hard for everything that I have. I study and do all of my work for all 5- 6 of my classes, and I work for my money and what I have by holding at least two jobs that average 18- 25 hours a week. It blows my mind when people only take 4 classes and still complain about being stressed.
Working during college is so important. No matter what your job is and how little you think it relates to your future career or your life, you still get important things out of it. You're learning time management skills, responsibility, and how to build a professional relationship with a manager or supervisor.
Yes, once you're an adult and start your career you won't have to worry about your schoolwork and grades, but you will have so many other things to juggle. Working is just a part of life that we need to deal with. Life is stressful and you need to do things that you don't want to do sometimes. Working and showing responsibility is such an important step to take.
Being an adult means earning your own money and budgeting for yourself. You shouldn't rely on Mommy and Daddy to foot all of your bills when you are perfectly capable of earning some money on your own. If you aren't working, you shouldn't be spending money on unnecessary things. It's just as simple as that.
By not working in college you are doing a major disservice to yourself. You're not learning the skills that other people your age are gaining, you aren't getting any experience, and quite frankly you're just being lazy.
If some people can take 6 classes and get good grades, have friends and a boyfriend/girlfriend, be in organizations/leadership roles, and work at least one if not more jobs, you can work a part-time job.