Saturn Moon

I have struggled with depression most of my life (still do).

I think natal Saturn (in Cap no less) square my Sun-NN-Mars-Merc must definitely have something to do with that.

I also have almost no Fire.

My chart is also laid out such that I have been under one Pluto transit or another pretty much all my life (or recovering therefrom) - 60 years.

Or Saturn aspecting the 4th house, which means conjunct an angle.

I attribute my depressions on my not understanding and managing the energies of these placements:

Saturn opposed the Sun, both squaring Ascendant 

Chiron on the ascendant squaring Sun and Saturn

Pluto on the Moon

Neptune opposite Mars

Depression has lifted after years of work, so there is freedom if you put in the effort.

I think a lot of Capricorn energy on your chart might show this. And I second what every else says about Saturn.

I suffer from depression and I have a stellium in that sign including Sun conjunct Saturn.