Why do I lock myself in?

Every day I come home and just lock myself in my room. It's not because I want privacy from my parents. Also I close all the drawers, and the closet door, plus I close the blinds on my window and close the curtain on top of it. Don't tell me to try and leave the door open a crack because I get so mad that I start crying and screaming. Please somebody tell me what's going on and what I should do. PLEASE!

We can't possibly know why, we can only ask questions and steer you in some direction to find out. And you'd have to have something wrong physiologically to say 'no reason' in any life situation sense. That could be it, hormones of puberty are too intense in your system. Or depression, or some other emotional problem. Some of those can be 'situational' meaning stemming from what is going on in your life, past and present, or again they can be physiological. My first question would be, how do you get along outside of home, at school, with friends, in stores and on the street and crowds, concerts, movies?
Please use Answer button below.

What happens if you don't go into your room, what happens if you go play ball outside instead, or go down stairs and watch TV

At school I'm fine, happy and I love being with friends. I hate stores, and crowded streets. But I love going to movies and concerts. I don't know why but I hate to eat at of home, and yet I like some crowded places at certain times and it's confusing because sometimes it all depends on weather I want to be all alone in the dark or be out during the night.
P.S. I prefer night over day, sour over sweet, horror over comedy, and revenge over peace but my life has been filled with rainbows, unicorns, princesses and lollipops and I have no bad memories at all. My parents are happily married, we have a great house, I'm happy with my looks and I have a good social scale at school and so far I've never been to a funeral. So what's going on!

Sorry I meant to say I hate to eat out of home.

Now you sound all normal and well adjusted... it's confusing that you would cry and scream so much just in your room. Can you talk more about what you are thinking and feeling when you close the door?