I'm the same way. For some reason I can't say my name but I can ask for a beer at a bar just fine..I'm pretty sure it's PTSD related for me atleast..I figure when I was little in school the whole class where falling off they're seats laughing at me bc I couldn't tell the teacher my name and I was abused for it so that created a irreversible stronghold in my brain from trauma and everytime I have to say my name I tense up to some degree no matter what I do or take to relax me..if there was a real way to reverse mental strongholds & phobias then I'm sure It would be fixed but unfortunately that sounds unlikely to me.