If you don't like what you're studying, DEFINITELY change your major. I got an MBA from a well known eastern business school, but like working with my hands and ended up as a hands-on building contractor for most of my career. I don't regret the time in college and it's been a big help, but you'll never get yourself out of bed to go to a job you hate.
I remember taking on a large expert witness project, where a builder was getting sued by more than 20 homeowners in one subdivision. Times were hard, and I was getting paid VERY well (I loved hearing the lawyers squawking about my bills), but I hated the picky detail and report writing and I'll never do it again. It was a fun hour, kicking their buts in court, but it was NOT worth it.
Don't kill yourself either - you can only do so much of it along with work and have any of it make sense. Hang in there bro'.