trouble communicating/speaking due to trauma?

hi all- this is my first time back on 7cups after a few years so i'm having to relearn where to put everything haha but hopefully this is ok (lmk if this type of post is better suited somewhere else). anyway, i was wondering if anyone else shared my experiences. i have complex trauma and i think that because of this, i have times of severe anxiety or just random time periods where it becomes nearly impossible to speak or communicate with others. it feels much easier not to say anything at all, even if i want to talk or i want company. this happens especially with my parents. i don't know how to explain this besides that i feel like words don't want to come out/i can't voice or think through what's going on in my head. i get incredibly frustrated and irritable at these times. it also feels wrong to voice my opinion or open up, and i think that's all a result of past abuse. i'm not sure this is necessarily a type of selective mutism, especially since i am about to be 18 and i think that usually applies to young children, but i'm really not sure. has anyone else experienced this/is it normal?