Think it like this;
1) You’re depressed and you want to kill yourself, having suicidal thoughts,
2) Will you actually go to that limit at attempting to kill yourself? No, your body and your instinct will always prevent you from actually killing yourself.
3) So stop thinking about it. It worked for me.
Then you are lucky you were able to turn it around by yourself.
It's true that body and instinct are designed to self-preserve, but some people still get to the stage where they are desperate enough that they can override that instinct.
Depression can occur as the direct result of events and stresses in a person's life, but it can also be the symptom of an inherent mental or physical disorder. It's not something that is easily 'switched off'. Many people don't even know why they are depressed, or the root of their depression turns out to be something other than what they think it is. Others are unable to admit, even to themselves, that they have a problem.
Although big strides forward have been made about raising awareness about mental health worldwide in recent years, there is still a stigma about it, especially for males, because males are less likely to talk about their problems than females. In the UK, 1 in 8 men have experienced mental health problems (that we know about) and 3 out of 4 suicides are men.
So for a thread like this to pop up on a gaming forum populated almost entirely by males is a good thing.