Happy to report from the perspective of actual life, some 30-40 years out, that not getting into boarding school (or, in my case, not the one you want so you don’t go at all) means absolutely nothing for your future. Immediate future sure (OK, no boarding school next year), but the rest? Feh. There’s absolutely zero correlation in my circle between attendance at boarding school and a successful happy life, and some suggestion that it’s actually a lousy choice for some.