Not to be a jerk, but that doesn't really make any sense. The OP obviously wants to go to med school. I'm pretty sure the adcoms realize that they wouldn't go through all the trouble of applying if they were seriously considering ditching everything for one job. And if it's a letter of intent it's more like "I'm really interested in going here. Look, I'm responsible and stuff blah blah blah, I got a good job..."