I went through the same thing in my Freshman year of college, although without the big debt.
When I was deciding what to do with my life, all I ever wanted to do from the time I was a kid was play with lights. You know, like theater stuff...did that a lot in high school. As time for college rolled around and I had to start thinking about what I wanted to do with my life, I thought about architecture, as I had always loved drawing and designing things.
My dad, being ever the capitalist, thought there would be a lot more money in engineering. He pushed hard for me to go to school for engineering, which I did. I actually thought I could do it...and become some successful businessman type person. But deep down inside, I knew it was not what I wanted out of life.
I made it as far as my third quarter in college. I was in the first days of calculus 3 when it suddenly hit me like a brick wall...I simply could not do that for the rest of my life. I could think of nothing more mind-numbingly awful than crunching formulas all day every day (oddly enough, I love math and doing equations these days).
So, I decided to pursue my lifelong interest in lighting and change my major to theatre. Of course, this was not well received. But, it has worked out, and quite well. I do what I love, and have tons of free time to pursue other things. I'm making decent money, although I'll never be wealthy. But, I don't need to be wealthy, so it doesn't matter.
But before I did any of this, I talked to family, friends, teachers, and several guidance counselors at school. Do not just make a rash decision...talk through it with those who will know your situation.
But, whatever you do...don't go into something you don't enjoy, especially something you despise. Life is not worth that.