I’m going to start with #2.
The perception that an MBA leads to piles of money is primarily driven by highly-ranked, high-powered MBAs - think top 15-20. In fact, I think that the average starting salary for all new MBAs is in the $50-60K range. And at Bowling Green State University, the median salary for MBA graduates is just under $48,000 (see [here](http://www.bloomberg.com/bschools/rankings/undergraduate_mba_profiles/bowlinggreen.html)), with only 62% of MBA graduates getting a job offer within 3 months of graduation.
An MBA does not necessarily confer a huge salary - you have to go to a top-ranked business school for that. Also remember that most MBA grads have post-college experience, and the salaries reflect that experience too. If you have no experience and an MBA from a mid-ranked program, your starting salary is unlikely to be a whole lot higher than you could’ve made with your bachelor’s.
Now let’s backtrack to #1.
It’s unclear to me whether you have any actual work experience post-college, or whether your hatred is dependent upon the classwork you took in college. Classes are very different from the day-to-day work in most fields. But the way to find what you like is to try things. Go find a job! If you like supply chain and ops, you can segue into science from there with some experience and coursework - operations research and industrial engineering are both related fields, and if you took some prerequisites as a post-baccalaureate student part time, you could eventually go into that field.
But you need some experience to help you figure out what you want to do, and what you don’t like to do. You need that before you go into a graduate program. Few people are going to want to hire a 21-year-old manager with no work experience.
If your parents exect you to have accomplished great things at the age of 21, then they have very unrealistic expectations. Feel free to ignore them. I know, easier said than done. But only YOU have to live your life - no one else. You don’t want to live your life on the basis of other people’s expectations. That’s a recipe for misery!
As for #3 - Yes there is the chance that you will work third shifts, and that can be kind of difficult on relationships and kids. But…you’re only 19 right now. You have plenty of time to work that out. If you went into supply chain now, by the time you are 25 you’d have 6 years of experience. You might be in management; you might have pursued a master’s; you’ll be in a better position to negotiate day shift work and better hours for your family. You also never know what might happen - you might change careers; you might not get married; you might delay marriage until your 30s; your spouse might also work mid shift; you may never have kids; you may not have kids until your 30s or 40s. There’s no use planning everything around a hypothetical family that you don’t yet have; you can make those decisions for your family when you actually have one.
I remember being there. I was making major career decisions on what-ifs that hadn’t happened yet. Don’t fall into that trap. You can work it out later. There’s no such thing as an “ideal” situation and people in all kinds of situations make it work.
5 - Like I said, an MBA doesn't automatically lead to a salary of $100K or more. But also realize that jobs with high salaries usually demand more work. There are few jobs out there that are going to pay you $120K a year and also let you have a 37.5-hour work week to be home every night by 5 to cook dinner or go to the kids' soccer games. You'll need to be prepared for some trade-offs.