I was brought up using British English. It got too ingrained in me to make any change easy or convenient. When you type, the spelling is pre-programmed into your typing speed. Thank heavens for spell-check!
After that many years in the country, I frequently still cross the road by looking right first.
My friends and colleagues (and spouse) perk up when I say "car park", "bonnet" because those words are programmed into me. They come out faster than I can think.
Even though the New England Patriots has replaced Man Utd as my favourite football team, I still sincerely believe that Football is round and not carried around on the field like a rugby ball.
I think we should continue with the euphemistic use of the word "toilet", rather than asking for "bathrooms" where we could neither take a shower nor have a bath.
I have a feeling that my bosses are not too comfortable with my intransigent language habits. OTOH, I feel so funny and disingenuous if I do ever try to learn an American form of accentuation when I speak.
So, fellow Americans, thousands apologies, I am trying my best. I am obliging myself to obligate.