I was born in West Yorkshire, lived as a child in Co Durham and N Lincolnshire then after a few years in Cambridge I moved to Sheffield where I stayed for 20 years. People always comment that I don't sound very Northern, although I've lived in the North for about 42 of my 46 years!
I think the reason is that W Yorks, S Yorks, N Lincs & Co Durham all have very different accents. Especially in the case of Co Durham which is where I learnt to speak. When we moved from there people laughed at my accent and said they didn't understand me so I worked hard to get rid of it. Also my parents don't come from any of those regions, my mum is from Cheshire & my dad is from New York! My mum had been taught to speak "properly" by her middle-class-aspiring dad and she worked as a teacher and tried to keep that up to pass on to her pupils, and of course to me.
So I never had one particular accent that stuck, and I learned that using my mum's Teacher Voice would at least get me understood! Which was then reinforced when I studied at Cambridge with a load of poshos!
I lived down South again for a year recently & now I've just moved to yet another Northern city. I've noticed that my accent was morphing into something like RP and losing any trace of any of those regions. I hate this, because it doesn't reflect who I actually am & where I come from.
The other night I went to a party with some new acquaintances and something possessed me to exaggerate my accent so it became a broad Sheffield/West Yorkshire mix. I felt more accepted by them as I no longer sounded "posh" & felt like one of the crowd. It felt quite natural to me once I got started, as though I was expressing a part of me that I don't normally express, as opposed to feeling like I was acting or putting it on. Although now I'll have to remember to do it whenever I see them 😬
I'm quite tempted now, given that I'm living in a new town & meeting new people, to just start speaking that way and reinvent myself as it were. I can't decide if it's a pretentious, deceitful affection or if it's actually fine to make an effort to speak in a way that I feel reflects the person I feel I am inside better than the teacher voice does.