i dont feel good

I wrote more of my book! I never tell anyone whats it about but because im anonymous i will tell: a 12 year old girl who sees self portraits turn evil, she becomes psychotic but denies it at first. Her so called fried, Ariel beats her up verbally about it and eventually physically. Chloe, the main character is then taken to the ER by her teacher when she hides in the bathroom. The doctors there suspect its her parents so they call them in, finding out that is was her friend Ariel, she gets suspended from school and....thats all i say for now. 
But basically, i should feel good about the book, and i did some of my painting, the outline. Ill see my sister wed and thurs, my eye is getting better (ive said it a million times) going to see med dr in about 11 days. So why dont i feel good? Is it just depression? It sucks, i dont deserve this. I deserve better, why cant i be happy? I should be happy and im not.