I feel ya' fancy, and totally agree with Mad Jack on the time off thing.
I rushed into med school straight from college, and the burnout shows. I'm still happy to be here and don't regret being in med school, but sometimes I feel like a bit of time off might have done me some good mentally. I definitely don't feel at the top of my game, but working my way back up slowly now. Just hope I can get the old me back in time for Step 1.
My classmates talk about backpacking around Europe, or all the fun adventures they had and things they did, and I sometimes wish I experienced some of that too.
Still, it's never too late, for either of us. As Mad Jack said, no kids, no family, we're still young.
I'm seriously considering taking a year off after M4 to do an MPH or something in a fun city if I can.