I always have dreams about escaping, particularly from someone?

Since I was little I've always had dreams about escaping from somewhere/someone, when I was very small it was a pirate ship and the captain, as I've gotten older it's been things like escaping teachers in clrooms, the most recent one being a doctor but it was in what felt like a school and I had to wait for the perfect moment to run for the door and run round corridors. But whenever I dream 9 times out of 10 its escaping from someone. What does this mean?