How do I know if I’m faking it

For context, I am a 20 year old non binary afab, I’m also autistic and adhd and have a history with severe childhood trauma, have been diagnosed with more things but not sure if that’s relevant. Since 2017 I have been questioning if I am a system, there is so much I don’t remember so I do apologise if this is hard to understand. I always remember having a sense or feeling that something was different, my memory has always been horrible, to the point of not remembering entire relationships I’ve had with people. I’m so use to someone coming up to me and calling me by a different name that I very vaguely remember using as a kid or teenager, I’ve lost count with how many names I’ve used with different people. I don’t remember why just the sense that it felt right but everything else is a blur. I’ve been hardcore dissociating all my life, multiple times on a daily basis and I usually can’t move talk or anything during it and sometimes come out of it feeling very different kinda like I’m just watching someone else talk but I’m still present just not in control. I don’t think I have DID because they don’t feel like a stranger they feel like a very fractured part of me, their purpose is to hold memories and trauma. There’s more than one it’s got to a point where on a daily basis I don’t know what’s going on, is this normal? Is this just all in my head? Am I overthinking? This feeling and instances have been happening for as long as I can remember, but I also don’t feel I have the proper knowledge or language to describe it accurately? my Therapist has also confirmed to me that I have dissociated fractured parts and have OSDD but she didn’t give me a diagnosis? Like no paperwork I mean I also do have CPTSD but is this real? Is this the normal experience to learning you’re a system? How do I communicate with these parts of so