If you do something stupid when you're 18, it's still stupid; there is no such thing as plenary indulgence for age.
then you, and the society, can be more or less indulgent on the consequences
bullying is a typical behavior of children and adolescents, it does not become soft and cuddly because the "young" do it
MC thinking about dropping out of college because he has an obnoxious and gruff roommate is as stupid as Zoey thinking it's her destiny to learn to surf
Well arent you a ray of sunshine... halfway expected you to bash religion and sports too while you're at it.
Now lets go over what you said. The MC "thinking" about leaving college is not even remotely close to being stupid, its a thought process, we have about 35.000 of those a day, give or take a few. MC leaving college, now that wouldve been stupid.
Destiny...unless my search decieved me, that word doesnt appear once in the entire interlude. Destiny is an outcome independed of choice, and I, for the life of me, cant even fathom a guess how you arrived there, when the entire first 25% are about Zoey explaining that surfing has always been her DREAM, her grandma supported her DREAM, and she ends up making the choice to follow her DREAM. A concept which is cherrished by at least one country that I know of and fail or succeed, rarely considered to be stupid.
So dont be so negative bro, its all good !