Need advice on 1st engine build - cam bearing damage

Ok, prepare yourself for the cam bearing disappointment. You buy the bearings, you buy the tool, you install the bearings with surgical precision. You step back very pleased with yourself. Not even a blemish in your new cam bearings. Start to slide the cam in............what!!!! It no fit!!!!! But but but you did everything PERFECT! Look at them!! It will break your heart to hear the solution.