I don't think I'm perceived as eccentric. More as irritable and hard to read, slightly 'weird'... because very early on, people seem to always think I'm agreeable and perhaps a bit of a pushover given that I don't make noise for the sake of making noise or talk for no reason whatsoever. Not fighting for the limelight where it doesn't matter always gets misinterpreted that way until people overstep their boundaries or say or do things they shouldn't and I tell them what's what. For those people, apparently, it seems to come out of the blue each time. It actually doesn't. I don't speak much unless there is something that needs to be said. And when something needs to be said it isn't always what they want to hear, obviously, otherwise I often wouldn't have to speak up.
And even in situations where I do speak more, masking isn't condusive to being seen as eccentric. It's never perfect, so over time there will always be something about me that seems off in a (harmless) way that people I know better have said is hard to describe, but 'eccentric' hasn't come up. Stand-offish has, aloof, even arrogant, which... honestly... I'm often under the impression that everybody thinks more highly of themselves than I do of me, so that keeps baffling me somewhat.
As for whether I think I'm eccentric... probably not. Almost everyone, NT or neurodiverse, secretly seems to think they're eccentric, weird, strange, quirky and the like. But I think that comes out of the fact that we each know our every thought, action, desire, wish, interest and pursuit... We see everything about ourselves and the ways in which we, sometimes openly, often secretly, don't conform. We don't see others nearly as completely. Not even life partners or close friends, if we have them, but especially not Jane from Accounts whom we pass in the hallway maybe once in a workday on the way to the coffee maker and who always looks so prim and proper and very much the corporate type... and who just may be having the same thoughts about us. Seems to touch on the illusion of asymmetric insight.
To me, 'eccentric' doesn't connote wealth, either. But it does seem to imply a certain – perhaps grudging – esteem for nonconformity, where it is used around me. Otherwise, you're just 'weird', and I think that what more people think of me.