I'm sorry you feel like that but do you not know how extremely improbable it is that you actually do exist and are here and get to experience life? There are so many more ways for you not to exist than there are ways for you to exist.
What you said also reminded me of the following by Jacob Bronowski: "Dream or nightmare, we have to live our experience as it is. and we have to live it awake. We live in a world which is penetrated through and through by science and which is both whole and real. We cannot turn it into a game simply by taking sides."
One of my favourite books is "Unweaving the Rainbow" by Richard Dawkins. It contains possibly my most favourite passage in a book ever, I turn to it frequently and I think it's appropriate to share here and if you are not much of a reader there's also an extended video of him speaking it:
"We are going to die, and that makes us the lucky ones. Most people are never going to die because they are never going to be born. The potential people who could have been here in my place but who will in fact never see the light of day outnumber the sand grains of Sahara. Certainly those unborn ghosts include greater poets than Keats, scientists greater than Newton. We know this because the set of possible people allowed by our DNA so massively exceeds the set of actual people. In the teeth of these stupefying odds it is you and I, in our ordinariness, that are here."
More than anything if you are unhappy do what you need to do to get happy again :)