Why does GOD do this?

Yesterday, I woke up in my room and went to class. I get this frantic phone call during class that tells me that a friend I have in my dorm has just passed away in his sleep. I immediately leave class without telling my teacher and run back to the dorm. The night before, I had spent time with him. We had played Halo untill i decided I wanted to get drunk so we ended about 9. He went to play poker with some of his buddies and he brought back my controller that i left in his room about midnight. I was wasted and said something about going to bed and he said that he was going to sleep too. He then said that he would see me tomorrow.
I arrived back at the dorm and they said that he passed on and we were having a mass for him at 6 that night. I cried for a while, saw a priest to try and get some explanations and had a friend of mine that works for the police try and find out what happened.
I don't know if all of you know, but I lost 2 friends this summer to a car accident and was hurt pretty bad. Now with this friend gone, thats 3 friends in less then 6 months. Why does God take away good people? I've been thinking that he doesn't care about anybody and just chooses, or that we are in hell right now and that good people are taken from this world to his heavenly realm becuase it is thier time. I'm just saying that all these terrible people are out there planning on killing hundreds of people and they just don't die in thier sleep. Its always the good ones. What do you guys believe? Discuss please.