it's possible. it depends on your experiences, symptoms, etc. which would be best to be discussed with a professional.

for myself, i always have known i had others. up until a few years ago, i was very dissociated, like a revolving door and lost among the others. then when things stabilized and huge life events happened, for some reason, the others went more quiet, and i spent the last few years defining myself and being able to function relatively well where the others are only around in more subtle ways or when triggered.

it took me the last 12 years to even talk about it all with my psychiatrist, so i have a confirmed (to me) diagnosis now of DID. i was too scared to say certain things for fear of not being believed even though it all is very real to me.