I am 18 years old and have always had a very active imagination. When I was little I could create entire worlds that I could play in with imaginary friends, people and animals. Now it's gotten worse. I seem to prefer the idea of my world inside my head. Even during the day my mind travels as I sit in class I could be out on a boat in the middle of the ocean. (I want to be a marine biologist and have since I was three) I have a few other eccentricities such as: twitching, not paying attention well, and losing myself in conversations about sea life. But I am most worried about the stories that go on in my head. I try to find ways to escape real life and I can talk to the people I make up in my brain. It's as if I am the main character in a movie that I write as I go and never really leave. I do actually speak out loud to my characters when no one is around. Please let me know if this is normal. I can give more details if necessary.

You can literally live off your world if you become a writer :D
Thats the only part thats like that though.
I think its good to be creative like this, because sometimes if youre in a bad situation, you just need to get away. i actually rather envy you for this! XD
But sometimes you may need to draw the line, as you don't want to get them mixed up, and you need to concentrate for stuff like GCSEs.
If I feel particularly sad every now and then, I often imagine myself at Hogwarts... Everyone has a place they feel safe!