Getty/Idaho Department of Correction Composite

Bryan Kohberger says prison life’s already a nightmare -- claiming inmates won’t stop hurling threats and crude sexual taunts his way ... and now he’s begging for a transfer.

In a handwritten note, the convicted killer pleaded with officials to get him out of Idaho Maximum Security Institution's J-Block -- just a day after being transferred there on July 29. People was first to report on the July 30 note. Idaho Department of Correction

Kohberger insists in the note he's not part of any recent chaos -- citing "flooding/striking" -- but claims he's getting slammed with "minute-by-minute" threats and harassment, saying he wants out of J-Block ASAP.

A few days later, he reportedly slipped a guard another note claiming inmates were scr

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