No, no - that part got wrong messages from people that should've known better, from day one.A part of me is saying "grow up" neither the trauma or the cancer is serious.
All issues interfering with the quality of life are serious. Goes double for illness, triple for chronic one, and way multiplied for things like cancer.
It requires care, & you deserve that care. You matter. Your caretakers/parents were wrong. Everyone reinforcing you don't matter in your life, was wrong.