Sung languages and spoken ones are different. From these comments it sounds like you don't sing much. I recommend this 1996 book by McGee: Singing early music

Sung languages and spoken ones are different. From these comments it sounds like you don't sing much. I recommend this 1996 book by McGee: Singing early music : the pronunciation of European languages in the Late Middle Ages and Renaissance https://www.worldcat.org/title/singing-early-music-the-pronunciation-of-european-languages-in-the-late-middle-ages-and-renaissance/oclc/32665004 https://www.worldcat.org/title/singing-early-music-the-pronu...