Since we don't know what country you are in it is hard to say. In the US being underage means it is not going to happen. Also you would need to talk to a psychologist before having such a surgery. Because it is permanent and a life altering surgery most if not all surgeons will not do such a surgery unless you have been confirmed to fully understand ALL the repercussions.
My best advice is for now find a psychologist to work with now and start saving your money so when you do become of age you are that far along.