Am I (28f) socially awkward or or AITAH?

I've (28F) always been under the impression I am a socially awkward extrovert. I am super nerdy and sometimes I feel like I maybe go too far in sharing facts or explaining things (or just being boring) so I have dialed back my extroverted nature and learned to just keep quiet over the years.

Now I get comments that I am "aloof". I have heard "I thought you were such a bitch when I met you but your so nice" as a weird backhanded compliment more than once and I chalked it up to my RBF (I have to consciously semi smile all the time or I look pissed, and it's just my face).

I feel like I don't fit anywhere. I've had issues at workplaces before- some to do with my personality, just being objective. But then also sometimes because I make it hell for myself by being honest or trying to do the "right" thing. My last place of work had a huge accounting error I found (that the CPAs, CFO and KPMG all missed) so I became hated pretty quickly because the company fell into administration. Before that I was basically outed (they forced me to quit) because the lead team member hated my guts. I kind of thought it was just situational..

I''ve tried dumbing myself down but the know it all part of me kind of comes out every now and then. I've never really had any friends, I was really heavily bullied in school to the point of being chased out (I came home with bruises the size of oranges on the regular from people chucking stones at me), but I was an American in a small town UK school back then.

I guess I am trying to give some context because I overheard a cousin (Gabriella 27F) talking about how much everyone didn't like me, as in the whole family found me annoying, how everyone basically wouldn't miss me if I disappeared. She said it in the hallways at a recent party and I overheard (I was leaving my room and the walls are paper). It bothered me and I've started questioning if I am an asshole and didn't know it?

It's not the first time I've felt that I wasn't liked, but it's been the first time I've actually had someone (especially from my family) say it.