I think you are my long lost twin! I am 23 & was in a our year business program because of the pressure of those around me to make big money. I was great at business and received great marks also...but I hated it! I had no desire to enter the business world at all. This semester I dropped my two business courses and am starting on everything I need for the RN.
When I think of being a RN...it feels like...well I don't know how to describe it. Just right. But I have a nine month old daughter who I didn't want to take a lot of time from because she is my life and she comes first. I have become a home health aide because of the flexibility of working how much/little I want and I am completing my nursing degree part time. Actually it is so part time, it will probably be 2008 before I see graduation but the HHA helps my husband with those little expenses like gas in the car, diapers...
It will work out. I believe leaving business for nursing will be one of the best decisions I have ever made for myself. (I hope for you also!) Where else can you find such a fulfilling career that challenges and excites you along with decent pay and amazing flexibility and versatility!
I think the only person losing out on people like us leaving business for nursing is Donald Trump! (But hey, if he ever gets sick...

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Anyways, I just wanted to let you know that there is someone out here who is in the exact same boat as you are. Don't give up!