Big troubles

Listening to: my conscience
Reading: "Harry Potter and the deathly hallows" by J.K. Rowling
Watching: It's me or the dog
Eating: a piece of cake
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I dind't go to school today and i'm not proud of this. I think my mother suspects it since she saw me waking up late this mornig and i wasn't ready when she left home. I've missed an art test and this is frustrating cause i didn't mind doing it! The problem was my Italian teacher. She told us to write a sonnet in Giovan Battista Marino's style and for the first time i wasn't able to do it. I tried but if i have to follow a certain style and respect it i simply go crazy, and this is what happened to me: my mind seemed closed at all and i couldn't think properly.
But the problem isn't the sonnet itself but the mark i would have got if i didn't brought it to my teacher. She wouldn't have listened to me, i'm sure. Not doing homework for her means a 2 and i didn't want to get it. I am aware i didn't solve the problem but i was really scared. I told my mum my difficoulty yesterday, when i was doing it, but she told me she didn't care but she would have been disappointed if i had got a bad mark.
School is destroying me, and i'm distroyng all my relationships because i don't feel fine. I think i'm depressed, nothing attracts my attention and i'm interested in nothing, apart from drawing. Can this be considered depression? Cause i dunno how to call it.
I'm sure i'm making my parents disappointed and they must be (well, they are!) fed up of my bad behavior: i never smile, i'm never happy and each week there's something wrong with school. I don't know what to do....i simply know i can't go on like this. This situation is killing me and is hurting all the people around me.
I think i will recive a punishment tonight when my parents will know the truth. I'd better study for the english literature written test and for the Dante oral test i'll have tomorrow.