Am I really trans?

So I (15M) want to be a girl, or I’m somewhat sure. I’ve been trying to call myself by my preferred name which I’ve been really attached to for a while, Luna. And I’ve been trying to wear more feminine clothes and look more feminine. Plus calling myself trans on the internet to see if I like how that feels, and I kinda do. I just can seem to figure out in my head if this is what I really want. Idk if it’s the mostly right culture around where I grew up, or the fear of possibly disappointing those around me, or just the possible burden I would be on those around me and on myself. I just don’t know if this is something I could do, or if it’s something I want to do. Some advice would be really helpful, I just can’t seem to make my mind up and it’s really stressing me out.