Most incoming grad students enter PhD programs with incorrect assumptions about how grad school works. A decent number of those incorrect assumptions involve the grad student role itself. For instance, I knew of a research assistant headed to grad school who was thrilled because he/she liked to learn in classroom environments, which is only a very small part of what grad school is at best (although coming out of undergrad, you might assume that it's a bigger part of a PhD than it is).
All prospective grad students should read over the following to understand what they're truly getting into / developing realistic expectations before committing a substantial amount of their life to the Ivory Tower. The first link covers toxicity in academia (YMMV), which is more or less what drove me out of lab work and into IT. I personally chose to remain working in academia because I find it meaningful, but in a role that was more insulated from academic politics (vs generic work politics).
[0] http://academiaiskillingmyfriends.tumblr.com/
[1] https://www.amazon.com/Getting-What-You-Came-Students/dp/037...