I am a firm believer in karma. If you let your negativity - your hopelessness - your bleakness wash over you, that is all you will ever receive. If you send out positivity - love - light, that is what you will receive in return.
I try not to dwell on negativity and the bad. I think to experience life you must experience the ups and downs, but you must also not let the downs take over your life. You must learn from them and grow.