How do I know if it's imitative?

Genuine question, how can I tell imitative DID from actual DID? How do I know if I'm making shit up or not?

I am constantly distressed by the idea I may have imitative DID instead of actual DID. That I've somehow convinced myself that I have it instead of actually having it. I'm utterly terrified that I'll be misdiagnosed, or I'll take up resources for people with real DID, or something similar. It's been about 2 years since my symptoms first showed up. I was aware of DID before my symptoms showed up, and they occurred about a year after my partner first showed signs of DID. I'm autistic and have done a ton of research on DID, which I've read is often a sign of imitative DID because most people with DID aren't aware of DID's existence before their symptoms begin.

I read the DIDR article about factitious and malingered DID and didn't really come to any conclusions for myself.

I don't want someone to tell me I do or don't have DID, I just want to know how I can even tell. Is there like, a sign? Or a couple of signs? Anything at all? I feel like I'm going crazy. I keep coming to with letters telling me they're real but I can't believe them, because I can kind of foggily remember writing them, so I'm probably just writing them to myself. But I don't know.

Just need help. Comfort, tips, or anything.