I think you meant to say “because” of your autism, not “be cause” of your autism, right?
If that’s the case, then yeah, I think it could definitely be an autistic thing! Like others have said, it’s probably an oral stim, and it could be a comfort item as well.
Personally, I think the latter aspect is what would separate it from being just an ADHD characteristic (since people with ADHD stim, too) — most people don’t use pacifiers as they get older, and it’s a fairly common autistic behavior to use items from childhood long past what would be considered “normal.” We like consistency and we tend to develop an empathy for inanimate objects more than others might, in addition to having a lack of awareness of or a disregard for social norms.
I don’t use a pacifier myself, but I do carry around with me a stuffed animal that I’ve had since I was a kid and take a lot of comfort in it. So I feel you on that.
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*** Autistic & ADHD late-diagnosee — self-diagnosed autistic at 21, currently waiting on an official diagnosis; self-diagnosed ADHD at 18, officially diagnosed at 18. ***