How do you get over the death of a friend?

My friend died a month or so ago suddenly. She was possibly the sweetest most Christian like woman (she was in her early 20's) that I have EVER met. I feel as if I'm all alone because although alot of people are grieving... I feel like I don't have the right to. She was one of my friends, but I wasn't that close to her and I don't know why I feel this way... I have known her all of my life, just wasnt that close to her. Her death is hurting me worse than I ever imagined. I have experience with death, even with people that were closer to me ( ex. grandparents, aunts, cousins).. in other words I know how it USUALLY feels. Please dont make fun of me or critisize, I just want experienced answers... please.