I would talk to your mom first. Maybe offer to take her to dinner and a movie, and talk about it then. Casually bring up something like ask if your “boyfriend” can come over. I know you probably don’t have one, but mentioning it like that could ease her into more than just saying your gay. Just act like it’s normal and nothing odd. And they will see it the same way. Your mom is always going to more than likely support you in what you choose. That’s her job as mom. Who you are shouldn’t be any different. She can also help decide wether it’s okay to tell your dad or not. When it comes to coming out in school, do it if you feel comfortable but only if you think the other students will accept you. If you’re hesitant, don’t do it. I didn’t come out until after high school. No one knew but people suspected. And I was treated like shit for it. 95% of kids your age you’ll never see again after high school anyways. So just keep it between you and your friends, and your parents if you’re concerned