This was me greeting guests at my new retail job.

I HAVE THIS SAME PROBLEM. I also say "Howdy! How you doing?" which sounds like "HOW THE HELL YOU DOING?" LOL!

This reminds me of a time when I was at the dinner table with my family and I was trying to quote Frozen when Olaf is like "Who's the funky looking donkey over there..?", and it twisted my tongue up and I ended up saying "Who's the f**king donkey over there?".

XD