To answer your curiosity without hijacking this thread, I was young, immature and hadn't had much life experience (like most people here) when I entered d-school the first time over a decade ago. Without going into detail, I had some personal issues that weighed heavy on my life. That combined with the continued build up of stress of school and a lack of desire (not dislike) for dentistry because I really didn't know much about it, I just wasn't putting much effort into school and was finding myself wanting to be down at the Riverwalk in San Antonio partying much more than being at school or studying. I passed, but not like I did in undergrad. I didn't have the desire at the time to be a dentist, so I felt I wasn't doing myself or my future patients any justice by being in school. I joined the Navy shortly after. I grew up in the Navy, got married and here I am a decade later back in my second year of d-school.
Hope that settles your curiosity.