Depression, over thinking lack of

Sir,i am really feeling very serious depression last 1 year..i could not focus on my studies anymore I m preparing for competative xams.its all because i got controversies with my father, his character has changed and he harassed me for not getting job and his narrow minded thoughts making me feel so depressed.he is demoralozing and discouraging me.and now i cant able to control my anger on my father,everytime my mind is ruining around him and his abnormal behaviour.and I m getting too anger and situation is out of range.I m too much frustrated.and overthinking also 1 problem I m smiling and m getting anxious for no reason and even talking myself.my mind is deeply polluted now..I m lacking with self confidence and I have lost enthusiasm on any thing..i really want to die..please give me a suggestion to recover myself to feel confident and focus on studies???