I want to know if I have depression.my dad currently suffers from lung cancer and I can get worried about him. my mum and dad separated I 2010 which I found hard to come to terms with and both have partners .I live with my mum ,brother and her partner which I hate and he is horrible and we struggle to get along I always feel she takes his side and we constantly argue.I thought me and my brother were closed but lately we have been arguing and everything seems to be getting on top of me.Arugments normally end up in me angry and flustrated and normally in tears ths happens about 2 times per day.i am in high school where I feel my friends are drifting away from me and I feel they keep snapping at me they don`t understand whats going on and I would never tell them.i ve never self harmed but been very close and I have thought about suicide (only thought I could never go through with it (thought what it would be like without me))please I need help???