lube and quit whacking the bishop so much.
do you use lubrication? my guess is you don't...while you don't think you did it "roughly" you may have had too tight a grip on your Johnson which led to your current predicament, particularly if you did not use lubricant.
Get your self to a pharmacy and look for products like "wet" or various KY products or if you can set foot in such a place, a porn shop will have more lube products than you can shake a stick at.
Jim