Okay, I've only read as far as page 2 here (you guys/gals have written a LOT of LONG posts

), so here's my 2 cents (if I read all 5 pages, I'd give you a whole nickel's worth of advice).
My first impression reading the OP is that there are two issues here:
1) A grass is greener on the other side problem of perception
2) Frustration with current coursework
On the first part, even in business, only the "cream of the crop" really make great money, and they DON'T get to spend a lot of time playing when they are in that caliber of career. If you walk around the Financial District in NYC at night...LATE at night...you'll see the cars lined up around the block waiting to take home those high earning businessmen and women, or take them to their expensive hotel rooms because they don't have time to go home. Sure, they have drivers waiting for them, but they're working so late they wouldn't be safe to drive as tired as they are at the end of the day. During tax season, they don't go home. They stay in hotels next to the office.
Every profession is like that. You can work comfortable or flexible hours for not so great pay, or you can work long, stressful hours for better pay. Once in a while, someone stumbles into some great luck and acquires somewhat of celebrity status.
You're more likely to succeed in a field you enjoy...one you have a passion to get up and do every morning for the rest of your working life. The only way you're going to be a top earner in a field is to succeed in it. If your preference is to work shorter hours and have more time to play, keep in mind you will not earn as much, so won't really have the money to spend on playing. It's a catch-22 of adulthood and the working world.
This gets to part 2...do you love the subjects you're studying? Are you getting frustrated because it's getting hard, or are you getting frustrated because you're losing interest and feeling like you're beating your head against the wall to force yourself to keep going? Since business is mentioned in the OP, have you ever taken a business course, as an elective or just to try it out? What about other courses outside your major? What did you think of them? Were your bored out of your mind? Did you find them fascinating? Could you consider getting up every day and doing a job that required using the knowledge from those courses?
Also, what would fit your personality? Do you really LOVE working with other people? Medicine has been mentioned a few times...would you LOVE working with SICK people who are grumpy and miserable and sometimes rude? Would you LOVE spending half your day filling out insurance paperwork? Could you handle the days when someone dies under your care? Could you handle the days you have to tell someone they have an illness you can't do anything to treat other than alleviate a few symptoms while they wait to die? Could you handle getting phone calls in the middle of the night from the patient who forgot to call for a refill on their prescription before all but one pharmacy has closed and needs you to call it in there? It's not like TV where the doctors waltz in, save a few lives, and then go out and flirt with the nurses, wear expensive suits and drive fancy cars.
Do you like peace and quiet to get your work done, or a chaotic, busy, phones ringing all day workplace? Do you need routine to get things accomplished, or do you perform better when you can have a flexible schedule? Do you need someone else to tell you what to do and set your deadlines to be productive, or do you want to be your own boss and set your own hours and schedule? Do you like working as an individual, or as part of a team? Every path you could take has different options that can fit different personalities. Spend time really evaluating yourself and your interests, and then look at what paths fit with that.