What should be included in an (My) Introduction if someone ask?

Well, sorry for my bad english. So, last week i went to a company to get a job so i had to clear the interview (my first). It was my first day in the wing after school/collage but personally, i wasn't that nervous like all those 6 guys were there. I was waiting them to call my name and then they did and i was like "gosh, finally" with a smile on my face. I wasn't really nervous. Then when i got into interview room and sat on the chair with a good expression on my face they asked me "how are you" and i said "good" then they said "Aarif huh?" and i said "Yeah, unfortunately" so all they 3 laughed, next question was "give us your introduction" and i replied "names Aarif, im 18 years old and just passed my school last month and... umm... and..." and then i was like *WTF what should i say next??* i was totally frustrated that moment you know. Then they said"whats your background" and i said"my background? What you gotta do with that??" means i was****** up. I still dont know what is my introduction, can anybody tell what should i include in that? Please..