I don’t have speech impediment but I have accents when I speak. I am trilingual but I have some type of accent in all three even though one of them is native. Maybe I don’t but many people say I kind of do? Anyways I pronounce bed and bad the same, pen and pan. Don’t hear the difference. And can’t say the difference. It creates all kind of funny stories like I say Pennies and it sounds Panties (with silent t).