A few qestions first, and I ask this because I am a mom and likely old enough to be your grandmother. Tell us about your mom? Is she super faithful or a CE christian (CE=Christmas/Easter, goes to church only on "holy days' And if a christian what denomination? Is she pretty laid back or is she a helicopter? Are you financially dependent upon her? How has she reacted to other challenges in the past? Is their a friend or relative you can bounce this off of before you talk to mom, get their perspective on how mom will react? What is the very worst case scenario that can happen? Are you close to your mom? Does it NEED to be now, or can it wait until you're out of HS and college and on your own? I was close to my kids and they told me lots, but I'm a laid back kind of mom anyway. Their dad they didn't tell so much cuz he's pretty tightly wound. If you think this is going to rock the boat in any way, approach with caution. And good luck.