Possibly.  If you repeatedly send texts, emails, Facebook messages, or other electronic posts or messages to someone under 18 that insult, taunt, or intimidate (frighten) that person you may have committed the crime of harassment.  These messages (known as cyberbullying) will be considered criminal harassment if the messages are written in a way that makes the person receiving them reasonably afraid he or she might be physically injured.  If you send such messages you may be charged with a crime.