wtf is up with that?

i understand the concept of convergence - when you unconsciously change your speech to mirror the person you're speaking to - and as someone with no fixed identity, i do this a lot. but i've spent the past year at home with just my partner and i hear myself at times sounding really posh, at other times speaking with a thick essex accent, at other times picking up element of my partner's geordie accent, and at times speaking with a strange, americanised international school accent and i think it's somehow mood related. it's like, who am i trying to be? it freaks me out a little bit and i'm wondering if there's an explanation. i'm english by birth but have spent the last 10 years being part of very multicultural scenes first in scotland, then germany, and i think this jumble of influences definitely confuses my accent more.

my handwriting also changes according to my mood - i can look at some notes i've made and know what mood i was in when i wrote them bc my "sad handwriting" is so noticeably different to my "excited handwriting" or "anxious handwriting". is this a quirk of having no fixed sense of self or am i in fact completely normal?