How can I speak propaly?

If you sound like you always have a cold, you might want to be checked at a doctor. My brother had to have his adenoids taken out because he couldn’t breathe, and it caused him to pronounce stuff wrong, or sounding like he had a permanent cold. He’d say stuff like “MY favorite dog is a boxer” but he’d pronounce it like “My favowit dog is a boxoawh” Always sounding like a child, or a person with a head cold. He got his adenoids removed and it fixed the problem completely after the blood drained from his nose after the surgery. He sounded normal again, but recently he got punched in the nose, and now he has that sorta accent again, and the doctors can’t seem to figure out why. He doesn’t sound nearly as bad though.

Also, have them check your tonsils, my tonsils had to be removed, and I sounded sort of like my brother did.

If that’s not the case, maybe you have trouble hearing? Maybe you hear yourself normal, but really your too quiet. Either way it wouldnt hurt to ask a doc :) I hope that helps.