You don't say if it is electric or glow? With standard (right hand) rotation there is a lot of torque from the motor which will make it, and all similar rotation airplanes roll to the left. This is often compensated for, by building in a couple degrees of right thrust. You say you built it, but if you unwittingly put left thrust in it, it very well could be "evil" as you have described. If possible try to find a local club, or modeler who can check it out. Those of us who have been in the hobby a long time can tell stories of people who have even had their controls reversed. There are a lot of things that could be wrong, and I'll tell you the same thing I told the last group of students who built an un-flyable airplane. Some times the problem is that you don't know what you don't know. More info please.