I'm pretty sure that I stole a computer that belongs to the school.
How did you manage to steal a computer from the school?
I walked out with the computer in my bag.
You are a thief and should not be stealing property that does not belong to you. You need to behave honestly and return the computer to the school or they could press charges against you.
Fine
I'm glad you agree, as stealing is wrong and getting in trouble is a very real possibility. Return the computer ASAP, as this will prevent you from facing consequences. Moving forward, I hope you don't steal again.