"Your brother shouldn’t be allowed to bully you in any way and at 12 you shouldn’t be feeling like you have the weight of the world on your shoulders."
have the weight of the world on shoulders - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.
I have checked the Free Dictionary looking for the definition/meaning of the aforementioned idiom and I have found it. However, it is beyond my capacity to memorize its definition from the dictionary thanks to poor concentration. Can I use James' words as an equivalent to that idiom.