And you still sound pessimistic. I have to agree that if you want to give up with a 3.5 gpa, before you have even taken the MCAT, than maybe you should look more deeply at some other options. How can you be so negative when your gpa is right at the national average for acceptance? If you are bent on numbers as odds, than being right at the average means that you have a better chance than 49% of the other applicants.
Most of the people here do speak from experience, but if you are leary of the opinions, than look at the literature. AAMC has all the average acceptance numbers broken down into every imaginable category. I wish you the best of luck, but at this point you really are sitting better than alot of us. Do decent on your MCATS, get some clinical experience blah, blah.
If med schools only cated about your numbers, they would not bother holding interviews. Your gpa(assuming other factors are ok) should get you interviewed, what happens from there is up to you and your determination. I can tell you that the biggest concern for most adcoms is recruting students that will stay with it for the long hall, through all the rigors, books, hours, clinicals, cont. ed., ect. Thinking of quiting already does not show that you can do that.If your not willing to stick with it now, than you will never have to worry about proving to them that you can handle med school and will stick with it if accepted.