Am I Depressed?

Nothing appeals to me anymore
When I go out I act happy
Because i am happy no more

I don't like to be around anyone
The Darkness is my friend, my only friend.
Everything! Everyone Bothers me!

When lunch comes around
Nothing has taste
Nothing has spunk Anymore
Everything is dead!!!

I'm continuously in LA LA land
That's all i do all day
Just thinking my life away

For heaven's sake I'm only 15
and i think I'm depressed

Or is it something else?
I really need help,,, because its killing me.