This is pretty common, actually. Typically known as code switching

Something that's odd and I've noticed about my behaviour is that I tend to have different "personalities"? (Not really) Sort of like... My brain will operate differently at different times... It's like... Imagine if at times your brain was the detective in the mystery novel... Like Sherlock Holmes, and it picked up on circumstantial evidence like he does (crime scene evidence), sometimes its more like the villain Moriarty where it profiles people and tries to work out the way they tick, sometimes it's insanely introverted, sometimes its other things aswell (there are more but none I am going to bother listing) I've noticed this and I'm not sure whether it's just because of like autism or something, or maybe there is something wrong with me... If anyone knows what I'm talking about or what it might be similar to please let me know, as I'm still myself so it's not different personalities but my brain will work differently and it's random I think... Idk anyway yeah please let me know

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I looked into it and that seems to be just about fitting in... That may be the case for me but it also happens in isolation... Sometimes my "character" can just switch... And this will affect the way I listen to music or react to stimuli around me... Idk if this is the right thing...