I want to feel empowered

I have been painfully aware of my people pleasing recently. I find I have an actual fear of speaking up for what I think is right. As a result, instead of being direct with people, I “hide” by avoiding, choosing not to communicate, or overthinking how I can solve a problem in a way that won’t make a person angry with me.
I believe this comes from my relationship with my mother who was the disciplinarian in my family. I rarely felt safe expressing any opposition to her as I feared her anger.
I want to be able to feel comfortable enough in my own skin to be certain that I matter enough to be able to voice my opinion no matter what anyone’s reaction is. It is like I have a little girl inside of me that is afraid to be yelled at or shamed. I am looking for some new beliefs or thoughts that bring about feelings of empowerment. Thanks!