The word "Deutsch" - note the spelling - is not an English word. "Deutsch" is a German word meaning "German". We don't use this word in English. "Dutch" is an English word, but the meaning is different. "Dutch" refers to the Netherlands.

"Dutch" is an English word that can mean both the language or the people of the Netherlands. The Dutch speak Dutch. And like Lucia already explained "Deutsch" is the German word for "German".

Deutsch is german for german and dutch is dutch (from the netherlands, I think)