I also had such a period in my youth, when nothing worked out in my life. Once I heard one such wise phrase, with which I immediately agreed, for after so many years of difficult life I myself came to this. The essence of the phrase was as follows: "all the problems are in our head!"
I understood this before, but because of the chaos inside I could not form this thought on my own. People who think about suicide, they reason with their mind, which is tired of internal chaos, decline. This is the reason for our depression: we succumb to self-destructive thoughts that destroy our consciousness. This is what needs to be treated first!