I Battle Depression

I honestly don't know what to do with my life anymore, it's my last year of school and its really not the time to be messing up but I'm so lost and my dads a complete douche my teachers constantly annoy me about it its just too much. I have spent so much time helping others I blocked myself and let it all build up therefor it is my fault I have missed over 4 weeks of school in total (random days spread out) and I'm just not the person to open up and tell you all my problems
Wth is wrong with me why can I help others but only make myself worse not even. I no longer have any motivation nor does guidance from others work and I'm constantly being told THIS IS YOUR LAST YEAR ITS IMPORTANT every morning I sit there and debate if I should go or not. I used to be so happy and now I feel nothing...