The edgy "world is dark so I'm gonna be dark too" mentality won't make you any happier than you already are. People cannot see the world as it is; they can only see the world as they are, i.e., through their own screen of beliefs. So if a person is cruel and hateful because the world is unfair to them, then they can only see cruelty and hatred in the world and nothing else.
It is not possible to experience anything outside of your own consciousness. One of the consequences of this is that the quality of yourself comes to imbue everything that you perceive with itself, so that reality becomes a reflection of your being. Therefore, to escape from the cruel and hateful world, the person must resolve the cruelty and hatred within themselves. This is the meaning of the saying “change the world by changing yourself.”
There's nothing in ssri's that blocks your chakras. If you go down that path you will only fuck yourself up more.