Not happy in my relationship

So lately I've been feeling like I don't want to stay in my relationship, usually we are inseparable but I just want to get away from him. He's calling all the shots we don't decide as a couple what he says goes and I just don't feel the same anymore, I don't get along with his family at all and I live with him, what can I do? I've felt like this for 3 days, could it be because my period is due/late and it's my hormones? I went out to town Saturday and I didn't want to come home to him so I went for a spin with my friend and came home at 6am, we both want different things in life but I can only do what I want when he's willing, he doesn't give me straight answers and I just feel rubbish and uncomfortable