I don't know how to fully explain this but I need some advice on how to handle this.

Me(ftm 16) and my sibling(f17) has known I want to be a guy,iv expressed this a lot in my life throughout the years.I knew that outright saying it would possibly be a mistake so I gave it years to brew.

My mom knew and accepted me with open arms and has been making an effort to using my name,since I appear to look feminine a bit I get misgendered but I don't attack people for it because they are still learning which is okay

But my sibling Em has knows for months now even years that Iv been going through life with my name.Em has expressed she was trans in the past but now says she isn't which I respect.She keeps saying she forgets but with her friends she has her arms open wide and never uses their deadnames. I expressed this before and told her i feel hurt and I don't expect her to care but I feel like she respects her friends more than me.

I got a "your right I care about my friends more than you" she says she doesn't remember but it hurts.We talked and she knows what I go by,it's been months since she knows,we live in the same room,my mom uses my name all the time.

I started to not answer Em unless she uses my name,is there anything I can do to smooth this out? (Each time Em went through names I always used them for her)