How can i be myself again?

ever since my aunt started getting mad at my dad for marrying her ex best friend she has been letting me and my cousin see each other less. since then i got the feeling she's angry at me too. so i try to keep her happy when i come over i try to act real good and i barely do anything. I feel like i can't do anything right when she and my uncle are around. I use to be able to get my cousin to laugh without trying now i feel like i am trying to hard and we end up with silent moments when we meet. Not only but its effecting my life now i can't think straight about anything and i over worry about everything. i just want to be my old self again. I have to deal with me being trans gender(ftm) and my selective mutism i can't take any extra pressure i fell like i am going to explode somethings