The best way to deal with depression is to understand the issues other face in their life.
When you start realizing others have big issues in their life than you and they are still leaving happy, your depression will automatically get decreased.
Stop worrying about something. if its going to happen in x way and not going to change, worrying about it will not give any outcomes.
Saying such things looks good but when implementing at initial stage it looks bad idea but over period of time when it becomes habit, it will send others in depression trust me