i came out when i was 13 and even though my parents had friends that were gay i was still scared to death to tell them. the best advice i can give is to just sit your parents down one at a time(id start with the one you are closes to first) and just tell them. start by saying you have felt this way for a very long time if not your whole life and that you know it is difficult to handle and a lot to take in but it is who you are. let them know if you have been with someone so that they know you are serious. tell them you respect them to much to keep it from them and that you hope they can understand. coming out isn't easy and it can be heard but once you do it feels so much better.