you may change your mind. you are very, very, very young to making that kind of decision.
Do you have the same opinion if someone that age decides they want to have kids? Deciding not to breed is no different than someone who decides to breed. Some people know from a very young age that they never want kids and others know that at some point they want kids. There is no switch to flick that will suddenly change a person's mind on that issue. Too many people breed only because of society pressure and regret it afterwards. There's no return policy if you pop out a kid and decide it was a mistake.