Ich bin ein Dummkopf translates as I am a fool/an idiot.
Dummkopf translates as idiot or fool.
No, I'm not stupid.
Ich bin nicht so dumm wie Du aussiehst translates as I'm not as dumb as you look
"Ich bin" translates from German into English as "I am."
Ich bin verrückt = I am mad
Ich bin Gott means 'I am God' in English.
It means "I am impressed".
ich bin so aufregend = I am so exciting
Ich bin in der Schule translates as I am in (the) school.
"Ich bin klug" or "Ich bin gescheit" are the required translations.
It means, "I'm a foreigner."
I'm already here
I am completely defeated.
Ich bin eine... - I'm a... I have no idea what a marbnette is supposed to be, it's not a German word.