Im scared someone will break in my house at night .?

So, I have a fear, that someone is going to break into my house. I usually have this fear when I am home alone in the afternoon, i usually solve my fears by locking my doors, having the blinds down, and locking my garage. But at night even though all my doors are locked, I am still terrified of a home invasion. I know it is not likely because I live in a low crime neighborhood. But I still have this fear, I have told my mother about it, but she thinks its irrational and i should toughen up, but its not that simple. I am always scared, Im scared when I am home, Im scared when im coming home. Im just always scared. It has gotten so bad, that I stay up all night, until the sun comes up and once it comes up, I go to sleep in my room, with my door barricaded. i don't know why, I am terrified at night, I just have always been, and we have no alarm, and lots of doors, and plenty of windows. Also my parents don't have any guns. During the afternoon, I babysit my little brother (3) and my little sister (7 months). So if someone breaks into my house, while im babysitting i can't just run to a neighbor's home. I am very paranoid, the slightest noise scares me .and my house is fairly big, so someone could break in. and me not even know it. I just don't know how to solve my fears. So what would I even do if someone really broke in my house, at night, or in the afternoon ?