What if I don't think I have a place in the near future?
That's awful. Why would you think that your future is so bleak?
My diploma is a dissapointment, I'm a failure. I might become a homeless.
I know that you feel as though you have not been a success economically, but it isn't in your best interest to be down on yourself. Take charge of your failures and learn from them so that you can get back up and try again.
How can I feel positive when I will be homeless and a failure?
Because it is not too late. There are things you can do to find your place in the future. It would be bad to give up now and to feel that it is all hopeless.