Constant Uncertainty

I have been in a relationship with Brian for 3 years. He is divorced with 2 kids and he has full custody. I am 38 years old. I have no kids. Last year I moved in with Brian. I own a townhome where I was very at peace and happy. Since moving I have felt constant anxiety and mental limbo. I constantly wonder if I should have moved, if I should move back and overall I’m exhausted. I don’t love step parenting and I don’t feel appreciated or like my boyfriend treats me all that great. I do think some of this is my own mental thoughts about the situation though. I really wanted my own family and this isn’t what I was picturing. I cannot stand to stay in this limbo, do you have any recommendations for how to make a decision one way or the other? I have always struggling making decisions and not having self doubt afterwards.