Profile Evaluation

I am new to this forum and for the past few days this nagging thought has been bothering me. For the past three years I have been going for the healthcare field, first it was Physical Therapy for my parents sake, and second for medicine but that decision was mine. I am currently 22 and with a 2.5 GPA as a senior trying to attain a B.S. in Biology. Now that GPA is a mixture of laziness in the beginning from lack of motivation in courses to financial obligations paying off tuition each semester. I don't have a hard time understanding the material, I just lack the motivation. I have a keen interest in business and stocks and many have told me in the past including my parents to go for business instead. But I felt as if I would accomplish nothing but money by retirement and I don't want to live with the purpose being just money so that's why I picked medicine. For the past few days though I felt extremely unmotivated to do anything, I still did well on my test today but I don't feel happy for doing well. I am trying this semester to turn my life around and I am making good grades but it's only because I "have" to now. I can't and won't screw up any further, so anyways while thinking for the past few days I wanted to change into something related to business and one day go into dealing with stocks. Problem is unlike medicine where I can retake the course and they replace it for the D.O. degree, I am stuck with what I have now. I have failed Trig three times and seven other courses (10 Fs) and it's not due to working hard and attaining that, just no motivation because it is needed for my Biology major. When entertaining the thought of going into business I found an interest in project management but I don't know how to go on right now. Is it worth it or should I continue with medicine? I know medicine will pay more, high job security, etc. but thinking long-term I don't see myself happy when I'm 50. I have a 2.5 GPA now and as of next week I will be working with my dad's best friend that own's a home health company in opening an assisted living. I brought the idea to him and he is giving me the resources and people to do it. That sounds like a step in the right direction but I want to know from an objective point of view how I should attain an MBA and I know I failed trig 3 times but I know this time I'll get it just due to motivation to go to class. For those thinking why I would waste three years, I didn't want to. College didn't cross my mind after high school, I was on my way to join the army but that all stopped when parents found out my plans. They forced college upon me and I know I should have gotten out early to take a break when things were not going my way, but I had to stay to keep my parents sane in the fact I'm getting an education. I know it's my fault and they are my decisions but I would like a second chance for a turnaround. I was thinking of taking Economics B.B.A. at another university and reset GPA there to show MBA schools I have potential then practice for GMAT and apply to a top 15 school? What would you recommend to do in my situation? Any input is appreciated. If it comes down to it I will continue with medicine and create business models with my partners, investors, etc. later in life but I would like to know what could I do to fix the current situation? Also on a side note I read somewhere that MBA schools like you to work two years minimum full time but they gave examples such as "marketing and strategy for Starbucks" or "work on the healthcare team for a fortune 500 company". I don't see how I would be about to attain that sort of level without a bachelors degree or even with one. How do you get into those positions? What positions are they looking for? Will AMC assistant manager be a good "position"?