I know this is a long thread, but it is very important to me. Please read and offer any advice. I need complete honesty, so hit me hard with the truth!! 
After high school, I went straight into college. I was never much of a partier in high school and when I got to college, I wasted a huge amount of time and money not to get a degree, but to discover that I have an alcohol problem. I spent 4 and a half years at a university, failing and withdrawing from classes left and right. I dropped out and moved back home, worked for a year and a half, and decided to try school again. Attending a different university didn't help, and my drinking habit only got worse. I withdrew from that semester and went to rehab. I returned to university and it has been three years since my last drink. During this time, I had a fresh GPA to start with, since grades from other universities don't transfer, only the credits. My "alcoholic" GPA when I left the first university was a shameful 2.20.
My "sober" GPA currently is a 3.82, which is a result of 7 semesters of hard work. I have come so far in my life and have worked so hard to fix the mistakes I've made. I think that I have done well, and am very proud of myself. But, I want more...When I was younger I wanted to be a doctor. When I was at my worst with alcoholism, I was depressed and thought of myself as worthless and unintelligent. But that whole time, I was wrong. I am not worthless and I am a bright, dedicated person. It took me a long time, but I decided that I shouldn't give up on my dreams just because I've made mistakes in my life. I am 27 and wouldn't be starting medical school (if I were to even get in, that is) until I am 29 years old. In my opinion you only get one life, so age shouldn't matter if you're working towards something you really want.
I took the MCAT and got a 24Q.
After being in a state of major depression for about a week, I decided that I'll just have to take it again. But then I spoke to a few people and they told me that my chances of getting into medical school at all are slim to none due to the fact that my first university transcript is so poor. In averaging my GPAs, I would barely be above a 3.0. So, I babbled about all of that to ask this...should I pursue a different career? I don't want to give up and let my past haunt me for the rest of my life, but I don't want to waste anymore of my time, either. I know for certain that I would be a wonderful doctor, and I can't remember ever wanting something so badly in my life. My heart hurts knowing that I may have ruined my dreams with my past mistakes. So, for anyone reading this, tell me the honest truth, even if it will hurt to hear it. On the other hand, if anyone out there knows of any success stories to help me with a little motivation, I NEED to hear them.

Thank you.