Coping Tips???

My best friend was recently shot in the face, and died after two days in critical condition. We've went to the same school since kindergarten, grew up together, we treat each other's family's like our own. Without him, I feel like I'm no one. I won't be seeing his beautiful smile everyday at school, I won't be practicing soccer with him anymore on the weekends, he won't be wrestling with my little brother after school anymore, his aunt won't pull me aside and say "you two will be getting married one day" anymore. I don't know what to do or how to handle this. He helped me through so much, and I can't seem to understand why out of all the people in the world, the sweetest soul had to be taken. Yesterday I tried looking at pictures of us when we were younger and my heart broke. The pain I'm feeling is worse than any physical pain I've felt in my life. Does anyone have any tips on how to cope? This is the first death I've ever dealt with, and I feel like it's the actual end of the world.