Model question

I have always been a person who internalizes other peoples actions, and I have a hard time disagreeing with people and standing up for myself. I get very scared and nervous to do it, and I want to be stronger to the point where I am not afraid to voice my opinion and I worry less about what other people think.

My question is the model says that everything that you think and feel is because of you, but I feel like this almost feeds into my behavior of people pleasing. If I can change my thought to make anything that happens acceptable to me, won’t that prevent me from taking action to stand up for myself more?