depression is caused by self worth.
how much you accomplish has no effect. how many friends you have isnt related.
your location, your hobbies, the amount of sun you get, the things you eat.
none of it affects depression. because more or less of any of these things, there are people who are and arent depressed.
its either you generally have low self esteem. or you set goals you know you cant complete, or dont set goals when you know you should be.
you have to give yourself value. no one else can do that.
technically there is nothing actually wrong in your life that you are being depressed about.
its your opinion of what makes a person have value, that you are not meeting for yourself.
or you can be lazy, ignore the causes, dont attempt the fixes, and just be a pill popper of anti depressants. lol