Why do i got so much depression?

i always fill that i should just shot all my enemies an kill my self an i never trust anyone just because people hate me for no reason an when i say no reason i really say no reason i really fill like if i murder all the hate an take the money im getting in 2 days should go to a gun an im only 16.......do i have a depression problem i got friends that i know got a hate in there heart to me........what i want is why are people hate me i think im crazy or am i just all talk i also think its all coming from football an my no job having dad drug addicted an Footballl kids saying i suck at the sport so give me something to keep my head up i fill like i live for my brother that is 26 ....an im only 16