One word jumps out to me with that - insecurity.
I'm making a wild guess, but possibly something - emotionally, physically, mentally - your child, entering puberty by chronological age, may have some/an insecurities/insecurity, about their own level of maturity at this point compared to their peers.
IF - a giant IF that has anything to do with it, the facts of THAT situation is normal; some are ready/mature sooner, and some later, but as the years go on the “slower” ones in the majority of cases do “catch up”. Any kid who has issues with that must be told that. Some “early bloomers” are even occasionally surpassed by some late bloomers, in some manner of maturity, somewhere between 12-13 and when most everyone has become an adult. I was an early bloomer in some ways, and much later bloomer in others. As others began to "catch up" to me, some went passed me, before we all seemed to even out by college. Somehow, someone has to sit with the kid and try to get to the root, and it may not even be what any initial angry words from the child indicate. Some "reasons" may be just the surface reasons and not the one(s) underneath it all. Hopefully, someone can get them to truly open up. Our prayers to you and your family.
the word that jumps out at me is schizophrenia