Miguel is right.
I won't regurgitate anything that has already been said. But maybe deciding to become a psychologist and help others in similar situations as you are now in could give you something to work towards. Something to hold on to. You are 15, so it won't be long untill you can really start to focus on a career or working towards one. Things may still be difficult, but I believe that having something to give you focus really can help. If it is something you are good at or find interesting then that will make it a bit easier.
~ The journey of a thousand miles begins with a single step ~
* Nothing in the world has ever been accomplished without passion *