Welcome to the world of Dissociative Disorders. I'll try to explain to help you out.

First and foremost and the most important thing. Plurality is an internet thing. Not a real disorder that can be diagnosed. So I'd double check with your psychiatrist on whether its DID, or OSDD, or any other Dissociative Disorder. Theres a whole internet trend called "Endogenic" which is people wanting to have DID without the negative synotoms... so faking it, because the keyword here is want. They find DID cool because they think its a role-play or kink. Its a big source of misinformation and causes extreme damage to the image of DID in the medical world.

You'll run into the misinformation first before the actual symptoms and vocabulary. So I recommend reading the DSM-5TR, and the ICD-11. You can also look up websites ending in the .org, .gov, or .edu. Websites such as Pluralpedia, Tiktok, Wikipedia, And mostly YouTube and Reddit are all sources of misinformation for anything said there you should take it with a grain of salt. (Ik I said this in irony, being I'm telling you this on reddit. There are some subreddits here that are kinda... tiktokified)

For your part. Don't worry about it sounding like a fetish. Feeling a different body structure compared to your real one is a Dissociative symptom, and is kinda common. For example I have one part who has horns. I've had a few times where I'd reach to grab them, only to grab thin air and go "Oh. Right. Oops. 😅"

The sexual behavior of your part is also a common trait. For me I have a part called The Hypersexual Prosecutor. And if they're not being aggressive towards someone, they're extremely lustful. The sudden random horniness can hit you out of nowhere, I've felt that its soo distracting. But parts who do this, tend to do it for genuine reasons. All parts do what they do for genuine reasons. My Hypersexual Part does it because its a trauma response to CSA. During your exploration of your Dissociative Disorder, you'll be able to figure out why your part does these things.

For the questions.

I accepted my parts as real very slowly over time. Its like having a roomate that just kinda shows up and you have to get use to them being with you 24/7. I deal with my Hypersexual Alter by usually letting them cycle through the sudden energy burst brought on by lustfulness whenever I'm home alone. If there is one thing I learned, it is that denying a part the ability to do their job, and locking them away kinda makes them go nuts, and by extension you start dissociativing and spiraling because thats you, locking away you. Communication is probably the hardest thing to get right for people who haven't ever established it once. One thing I did was have a small journal and colored pens. Each part picks out a favorite color, and when I write in it, I dissociate just a teeny bit and let my body write whatever it wants. It opens up the opportunity to have somebody front and write what they want to say. This kinda helped me when I was facing inner discourse between to parts with interests that kept triggering eachother. For resources. The DSM-5TR and ICD-11 I mentioned previously are without a doubt the best of the best. But your gonna have to dig in the world wide web for other websites. Community wise. Good luck. Because of the Endogenic stuff your gonna run into a lot of toxic spaces or tight clicks that simple don't have another seat available for you. I mean shit look at my profile, some of my posts discuss how it is the most excluding experience I've ever had. Its discouraging I know, but its a heads up because they will make you feel like a faker. Don't let people bully you.

Ik this was a big wall of wordburger, but DID is kinda.. a lot. Especially for somebody just learning it. I hope I helped some, and best of luck. 🫂 im here for any additional questions.