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I know it can be very difficult to remain positive when your situation appears and feels so bad. My mother tells me that 'nothing lasts forever', and maybe this is true.
We only live a limited amount of time, our entire existence does not last forever, in the current form at least. Winter does not last forever, nor does summer.
We may suffer for a while, in the cold, or the heat, but the situation and environmental conditions are temporary. We know nature moves in cycles, and so do humans of birth, life, reproduction for many, and death.
Find some light admits the darkness, move toward it, make decisions for the better and work towards positive change.