We are going to have really hard days but we are going to have good days too. Maybe you can't see it clearly but it will happen to you, if you are going throught something bad you should know that. Think the sadness as something that it will leave, because it will, trust me.
When I have bad days I really think that I'm going to broke but then i feel good again, it seems like a horrible game, but that game makes me realice that I learn from that and I'm stronger now. Life is not perfect for anyone. Perfeccion doesn't exist. So it's Ok if you are feeling bad just know that you can deal with that.