i've just become disillusioned with the business world and the work that it entails
it's very boring dry and uninspiring to me
You've described why you want to make a change based on how you feel about your current job. Believe it or not, most people feel this way at some point, even in their chosen professions. It will be MUCH, MUCH more work to change professions than you could possibly immagine. LOTS of it will be boring, uninspiring and sometimes seemingly pointless. It takes incredible strength and fortitude to re-boot your life in any job, but even more so in medicine. You'd better want it more than anything else you've ever wanted in your life.
But, to answer your question...
I spent my previous life doing the jobs I was expected to do, for the reasons that most people are expected to work. First, I worked to pay for school, doing whatever cruddy job I could make a few bucks at. Before too long, I was working other cruddy jobs that paid a little bit better, to support myself. Then, I got married and had a family. I took the jobs that paid the best in order to support my family. Through it all, I was always drawn to the hospital in my spare time. Through it all, I knew I was meant for something more. I found I would rather discuss health issues with people than talk about football (and I love football). Every other thought in my head was about medicine. Still, I realized that it was a very long path. For me, a career in medicine meant a complete 180 in education. I was a 2.4gpa in highschool, and less in college for the one year I went. But several years of maturing and some time earning a disciplined mind in the Navy gave me a new lease on life. While I was slaving at one of the "cruddy" jobs for 50 hours a week to support my wife and kids and taking 13-18 credit hours of classes, I saw and knew in the deepest part of my soul that I wanted this more than anything else. I saw it because no sane person would do the things I was doing unless they were dedicated to their goal. What's more, I was doing it well. I was doing it well because I was doing it for me. I was doing what I was meant to do. Four years of college later and I was still taking the hits and jumping through the hoops because I was meant to go to medical school. My MCAT study months were some of the most grueling of my life, but It was worth it to me because I was advancing toward my goal.
I hope that the passion that I have for medicine is evident in this post, because the passion is what drove my change. I can't even describe in simple words how much I want to do this. Most of the folks on this forum who are serious will have similar stories and be just as passionate about their decisions to pursue medicine.
If you are meant to make a change, you will find a similar passion. It may not start at the "crazy board poster" level, but it will grow and grow until it is the all consuming driving force in your life. If it's not, then you haven't found where you're meant to be yet.
Find where your passion is. Follow it relentlessly. Do it for yourself and not because someone expects you to. Don't do it for the money or the prestige. Do it because every step of every day of your life has been leading you to the path that takes you to your passion.