you need to start being postive and i'm sorry but your being really selfish and to be honest it's probably not your fault because your feeling like this at the moment, but the fact you said no one cares about you TRUST ME THEY DO! there will be at least one person in the world who cares about you, you've said your mum got you a councellor-fact that she cares. I'm a person who knows what it's like to lose someone you care about to suicide AND IT'S NOT NICE so no matter how your feeling right now, you'll make the people who care about you feel 10x worse than you do at the moment
Take yourself out of the whole situation for a moment, it sounds like maybe your goign through depression and you can come out on the other side if you just stick with it, think of others too and your life won't seem that bad really, i mean you've said you lost a girlfriend who meant a great deal to you and you seem alone in the world, but that's all you've said. There are many people in the world who are MUCH worse off than this and they cope, it's doable.
In like 5 years or even sooner , you'll hopefully be out of all this and think what a plank you were bing

seriosuly there are things in life that can make you happy, just find them
I'm on msn if you want anyone to talk to more....