Why am i depressed

why am I depressed
im so pestimistic all the time
im just wondering so if anyone knows and is willing to share the info please do

Several psychological theories, the biological model believes it is because of an imbalance of neurotransmitters in the brain, the cognitive theory is basically faulty thinking, and the behavioral theory is basically you get into a cycle of behaviors that promotes depression.
Personally I think its a bit of all of them... your neurotransmitters are a little messed up, you start thinking negatively, so you start into a pattern of behavior that reinforces your thinking, and you end up with depression...
Ok, so to put it simply, your brain is a little out of balance... It happens...

GO TO A DOCTOR YOU COULD HAVE DEPRESSION,ESPECIALLY IF IT IS OVER NOT JUST BIG HAPPINIGS BUT SMALL DAY TO DAY EVENTS AND SOMETIMES LASTS FOR A WEEK OR LONGER OR

IF YOU ARE DEPRESSED OVER ONLY CERTAIN SUBJECTS IT COULD BE YOUR INSECURE ABOUT WHAT EVER THOSE CERTAIN SUBJECTS ARE LIKE LOVE, OR FRIENDS, OR DIETING AS EXAMPLES.

like the above people say...there are lots of reasons for depression.
it can often make you pestimistic.
I'm the same.
no optimisium, ho hope for the future.