This. Becoming a GP in the US by any route other than the military is going to put you way behind just about any of your undergrad classmates with a marketable degree if you consider lost opportunity.

There's also something else to consider. 7-13 years is a long time, and lots of things in your life will change. You may not be able to or want to practice medicine (I know one of each), but that debt isn't going anywhere.