So embarred please help?

OMG just now I was singing a song: Hallelujah- actually and my auntys and family heard me - feel like crying. And when I finished, I thought nobody heard untill my dad yelled: "SING louder!" and they roared out laughing. Even worse: My mom was like: "Oh she sings in the shower too thats why she has so much dandruff!" (She always makes it worse.) Just now my dad walked in and said "Sing Hallelujah!" HELP!