I just noticed something in your posts you have been diagnosed with PTSD and depression and anxiety. here may be why when they diagnosed you with those things you did not get a DID diagnosis....

from your post above....
at school we all have certain classes that we'll front as. At home it's mostly just one of us who fronts all the time.

Dissociative type alters affect all aspects of a persons life, they dont only come out at school.

short version dissociation is a response to negative and positive triggers. a trigger is anything that makes a person feel dissociated (numb, spaced out, disconnected) on a normal level this happens many times a day to human beings... they feel extremely happy and start feeling numb, spaced out, they feel sad or have been crying they srart feeling numb and spaced out, they are driving their car and the repetative motion makes them feel spaced out and numb... just the way the brain works. it doesnt matter whether the person is as school at home at work, socializing with friends... it just happens.

it becomes one of the mental disorders when it meets special guidelines. the guidelines for america are in my link at the bottom of my post.

my point is that since you say this doesnt affect you at home only at school that pretty much disqualifies it as being the disorder level of dissociation called DID. heres why most people get triggered at home as well as at school, example what happens when your parents grounded you or yelled at you. thats called being triggered. for people with DID that would have caused an alter to take control at home, not stay one fronting at home most of the time.

im not trying to discourage you or diagnose you, just making an observation as to why when you were diagnosed with PTSD \depression\anxiety they didnt also diagnose you with one of the two dissociative disorders that include dissociative type alters.

you can find out for sure whats going on by contacting your treatment providers, they can explain to you why you were not diagnosed with DID or OSDD when they diagnosed you, you can also ask them for an updated evaluation to see whether what you are going through is DID or OSDD.