How can I build trust in god? All faiths answers welcome...?

After some negative life experiences I turned from an optimist to a pessimist and told myself that my trust in god and all those years of praying had been wishful thinking, idealistic delusions. I went out of my way to look at all the hardships innocent people are suffering and have suffered all over this world for centuries, how unjust and unfair it is for so many good people nevermind me personally. How people like Ghadafi get ahead and become leaders of countries while sweet and moral people are the ones who stay impoverished or even get killed by the likes of despots like him. A part of me wants to believe and trust in god again but I don't know where to begin anymore. I don't know how to trust that he/she/it is real and I don't want to be naive and too idealistic/optimistic like I was before. Any thoughts?