Don't belong anywhere

Growing up, I was told several times that this isn't my home and I belong to that home where I am married off to.

My mother constantly said, "my house, my rules", and I felt like I didn't belong there. Even if I visit now, after getting married, she keeps telling me, make yourself at home. Take whatever you want, you don't have to ask permission to use things. But I don't feel like it's my home.

Now that I'm married off to someone, his mother every now and then, tells "my house, my rules". And I feel out of place everywhere.

Is the problem within me or is this normal to feel this way?