The age of majority in the state of kansas is 18. HOWEVER, they don't have to read you your rights until they put the cuffs on, SO IF THEY ASK YOU A QUESTION BEFORE THEN AND YOU ANSWER IT, IT IS ADMISSABLE IN A COURT OF LAW
So even though you were under the age of majority, unless they were formally arresting you, they don't have to ask for permission to talk to you. You always have the right to STFU, but in this case you chose not to exercise it.