Oliver/ Xela Luna, I ID as biqueer or pansexual; pronouns she, hers, they, theirs. I just wanted to offer more support to you from here....I know at 15 it can seem like forever til you can do this or that, or be your true self! My mom was actually the last person I came out to; my family is very Left or liberal politically, socially, but my mom has a lot of childhood issues from abuse and abandonment, and I'm an only child - a child they didn't expect to be able to have, and I was born very premature so there some medical problems. so she can have a hard time emotionally with certain things that are "triggers". I remember so well the time I was in high school and wanted to badly to go to the Pride Parade downtown but had no way to get there from where we lived<I have learning disabilities and learned to drive in my 20's. did not know how to take bus due to mother's overprotectiveness and difficulties with directions, schedules, processing information> So I'd phoned someone about the Parade and actually managed to talk to one of the organizers who said if I could get down there, she'd walk with me. I was really scared on the phone - I was also a shy kid and somewhat emotionally behind - and then my mom came home, she'd been gone. I was in my room with the door closed and she knocked and said what are you doing? I just hung up on the person. Didn't get to the Parade. It was just really a hard time. But college totally opened up everything and I remember thinking- wow, I have a life now! I came out and was pretty much out to everyone in college. Is there a trusted teacher at your school you can discuss any of this privately with and maybe develop a GSA <Gay/Straight Alliance technically but such groups generally are bi/Queer/trans/I-inclusive>
Stay safe and maybe you can see if you can discuss privately with your grandmother so you would have some family support...maybe see if she'd be open to reading some basic material on trans folks?