Hi you there!

I'm 18, I'm at college, studying Business Administration and I'm from Argentina :)

Hi you there!

I'm 18 years old, I'm at college, studying Business Administration and I'm from Argentina:)

Hi you there!

I'm 18, I'm at college, studying Business Administration and I'm from Argentina :)

Hello, Teacher:

I'm going to correct myself:

"I'm 18 year old (without "s"), I'm at college, studyind Business Administration and I'm from Argentina."

Hi you there!

I'm 18, I'm at college, studying Business Administration and I'm from Argentina :)

This is good, but this will flow better.

I'm 18 and I'm at college studying Business Administration and from Argentina.