Ugh... This life now sucks.

it sounds like you are suffering from depression. hormonal imbalances during puberty can GREATLY influence emotions. i am in yr 10 myself and am hating just about everything lately. has any major emotional incident happened in your lie, for example, has a loved one died or are your parents divorced? my own depression was triggered by the death of my girlfriend 2 years ago. a lot of people say this but TRY to be patient and it WILL get better over time. having someone to talk to helps A LOT, try talking to your girlfriend. when your depressed you may be quite irritable or cranky and my have a go at people you care about, so try to keep aggressive thoughts and emotions inside at school, as if you let them out, thing can get out of hand and you could hurt yourself and others. try using your alone time doing school work, or talking to your girlfriend, anything to keep yourself distracted so you dont end up thinking about it all the time, that will only make it worse. try to cheer up.