@MiaMarshmallows
No she knew the cat already. Knew it's name was Bonnie.
I doubt many cats are called Bonn-eh to be honest.
As I said she does it all the time. Not just with the cats name.
What you’re describing here, OP, is just a pronunciation difference which comes with a regional accent - it sounds like someone from the north midlands or around there. You don’t have a ‘weird’ voice - that would apply to your cadence, volume, pitch etc - but you seem to be bothered by the way you pronounce words. And everyone does that differently! I am from the SW but am quite RP in general, though occasionally my rounding of sounds comes out, and even more oddly, some very northern pronunciations which stem from being with a long-term northern boyfriend. So many people I know have picked up odd bits of accents from places they have lived, here and abroad, and have hybrid accents. It’s not even something worth remarking on.
Your cousin might have had a very small and sheltered life and therefore not encountered people with different accents from her own - in which case she is the unusual one and the one to be pitied.
If you really do want to rid yourself of an accent, there are probably coaching videos on YouTube - or just listen to an actor or presenter whose accent you like and try to copy theirs. I sometimes fancy being Scottish personally, and I might do it one day.
It sounds to me like someone or something in your life has made you fear difference and feel it’s in some way a personal failing. I think that you need to reframe that and celebrate the fact that you are a wonderful, unique YOU, and nobody else can ever be the same. Some therapy to work on your self esteem might be in order.
Remember also that beauty fades, and nobody truly values friends for how they look - they value them for their kindness, loyalty, ability to bring cake to cheer them when they’re down, their ability to make things fun, their truthfulness and their myriad other qualities which have nothing to do with what a person says or how they look, but how they act, what they say, and how they make another person feel.