How easy is it to think positive?

I am serious. Sometimes it is too hard to think positive. There are so many bad things happening all in a short period and now it is one of the moments that I am thinking about so many problems that I have. I do not see any solution, absolutely nothing. The worst is when I talk to my friends and all they do is saying *think positive*. Very easy to say, but how to do it? I think they are not in my situation to know how exactly I feel and the worst is that noone is helping me mentally. All I can do is just to hope even though I know there is a very little chance that everything is going to be ok. I wish someone could really help me to think positive.