Liam Lyburd was convicted at Newcastle Crown Court of possessing an arsenal of weapons, including pipe bombs and a gun, with intent to endanger life.
Judge Paul Sloan Lyburd said, "It was only a matter of time before you would have put your plan into action. Your emotional coldness and detachment and your lack of empathy to others was self-evident."
The teenager laughed as he was taken away by police, telling officers they had saved lives and prevented what would have otherwise been a massacre at the college.
Detective Superintendent George Duff, who led the investigation, said: "He at no point has shown any remorse for what he intended to do."
In a deleted file recovered from his computer, Lyburd wrote: "People will die, there's no question about that."
Jurors heard that the "cold and detached" teenager held a grudge against Newcastle College after he was kicked off his course for bad behaviour.
"You people ruined my whole life, don't expect me to show mercy today. No one disrespects me and gets away with it. I'll teach you people a little lesson on respect with my 9 mm jacketed hollow points," another deleted computer file read.
The bag also contained a Glock pistol and 94 hollow- tipped expanding bullets.
Officers also recovered webcam pictures Lyburd took of himself dressed for combat, armed with the pistol and brandishing a knife.
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