Although I can't relate with the movie in your write ups, but one thing is sure, I got the message portrayed in the topic, which I strongly believed the movie is all about. Honestly, on personal level, I have never felt that way in my life before thinking that I wished I wasn't born at all.
I know so many unfair things has happened to me in life, but it has never made me to feel that way, not for once. All the unfair things that has happened to me has been me to feel more alive about life. They have made me stronger. They made me realized that life is not a bed of roses and it not always a work in the park either.
I know we are not the same in terms of how strong willed we are, and on how we view the world. Most people usually get broken by little things others would take in their strides. In all, we shouldn't condone depression, in spite of our circumstances by thinking I wish I wasn't born.