Depression is from the saturation of a small problem that is experienced, a long time accumulates and when the brain response is a problem, it will be the toughest because it accumulates chaotic feelings in itself since a long time ago. the effect is gradual and this must be rehabilitated by yourself or the help of others, no matter how good and great it is, it's called a human brain response and feelings come randomly.
Indeed, all advocate doing more good in this world while still alive, and believing there is a beautiful place waiting is a good faith, but not for people who commit suicide, because they don't believe in God's destiny and then hope for God's protection and treatment after committing suicide, that's ridiculous
Depression is a medical condition, just like having a heart problem which we can't help ourselves and can't blame why it happened.
Suicide is a delicate subject that I will never make fun of them because we can't feel their situation until we feel that. Religions and what ever are here to help the people to be more socialize so the chances of opening to others will help them and that is not the situation anymore.
There is still plenty of time to improve yourself rather than regretting being affected by diseases that come from bad human habits themselves including depression. if you grow awareness of something that is experienced, sometimes depression arises from veto thinking even though the reality is not necessarily the case, is there anyone around you who is experiencing this?
By the way, exercise and adequate rest can cause calmness, happy hormones and relieve stress and depression, of course it must be regular.