trying to get into med school

As of now I am 21 years old and junior in college and one of my goals in life is to be a Doctor. Although I am majoring in constructiong engineering, I am getting a minor in Biological Sciences. I came down here to USM to pursue a career in construction, but like most students I didn't have a clue in what I was truely passionate about. After finding my passion in medicine, I found out that most medical schools would rather have students with (example:) art majors appling, rather than pre-med. From what I found, med. schools like having incoming students diversed degrees, but all med school have the same pre-requists: 6 hours of a english, 8 hours of general physics, 8 hours of general biology and chemistry, and 4 hours of organic chemistry with an undergrade of your choice. After doing the research, I found out how hard it is to get into med school and there are 3 aspects that med schools look at. One is you overall GPA, your MCAT score, and the interview with the med school you are appling for. I also found out that the more letters of recomadation you have by Doctors, the better and mostly, who you know, not what you know. Over 16,000 college students apply for medical schools across the country and it is a very competive process. At USC, over 7,000 students applied and only 162 students got in last year. With all the years of schooling and training, I am debating on weather I want to go through this process. Even at the age of 21 I still do not know what I want to do with my life. I don't know if I am just scared because I know that the real world is appoaching very soon or I am affraid that I am going to be putting in so much time and money into something I am going to hate 5 years from now. Every body I talk to you that is over the age of 30 says that every year from the age of 20 on, your mind set and views change as you get older. So something I love now, might change into something I hate. If I had to do things over, I probaly would of worked for 4 years, waited till I got older and wiser to pursue a career that I will love for the rest of my life.