Rage by Steve Gerlach

In some ways Ben is like a lot of the other guys in his college. He's kind of quiet, he likes movies and books and spends most of his time by himself or in the library. He's a little awkward around girls, but he keeps trying and hoping that someday soon he'll find the love of his life. No luck so far, though. But in one very important way Ben isn't like the other guys at all. You can't tell by looking at him, but there's something simmering deep inside of Ben. Lately he's been thinking a lot about some pretty awful things... and he's bought a gun. His loneliness has become bitterness, and his resentment has turned to hatred. It's all boiling up inside him and it's only a matter of time before he explodes. Then it's just a question of who will be the first to die.