I'm sorry you're going through this and sorry you were treated that way as a child. I grew up in a abusive home where I was made to feel like I was worthless. I figured nobody cared and nobody would listen. As an adult it has affected me too. I've started coming out of my shell. I started off evenly with small things. For example at the grocery store I asked the clerk about a brand of cookies. He showed me their location and said he likes them a lot. I bought them. When I tried them at home, I didn't like the cookies. When I saw the clerk two weeks later he rememberd. He asked what I thought of the cookies? I hesitated at first but suddenly said "Well actually I didn't like the flavour. I'll try something else." He looked st me and said no problem ,you will find something you like.

That may seem trivial but for me it was a first step in stating my opinion. Maybe starting with something small and building up will help you too. You deserve to be heard and you're opinions too.