Agree with all that say let someone else shoot it- it may not be you, but if you keep shooting it, you are going to lose all confidence in your shooting ability and then you will surely shoot poorly.
If it is in fact you and it is the recoil to blame, there are ways to deal with it. First off is rifle fit. I cannot believe that 14.5 inch length of pull is enough for a man your size unless you have very short arms and/or an extremely large chest for your size. I am 5'10" and my 404 has more length of pull than your rifle. Yes I am thin and have long arms, but something doesn't add up. The 404 was built to fit me and while it has a lot more recoil than my 30-06, it isn't much more bothersome because it fits better. Worst recoil I've ever experienced was from a .270 that happened to fit in such a way that the gun hit me on the coracoid process. Fit matters.
The various recoil pads and weights do of course make a difference. Most people advise working up to recoil- start with a .22, etc. I take the exact opposite view. If I shoot a light pump shotgun with 3 inch magnum slugs for a while and then switch to my 30-06, the latter feels like a cap gun. I gain confidence that the heavy hitter didn't hurt me. Much of recoil tolerance is psychological. There is a bunch of noise and a kick our brains trick us into believing something bad is going on.
Finally, I do believe there is great value is controlled muscle tension. The rifle should be very snug into the shoulder so it doesn't get a running start. But, and this is the tricky part, the rest of the body should be relatively loose. If the whole body is tensed up either with anticipation or because it is not easy to contract some muscles and relax others (although we do it all the time when we walk, it isn't easy to do on purpose) then the body can't move with the recoil and it hurts more. I know when I tense up the shoulder that will be taking the recoil, it it a lot more bothersome than when I roll with it. It takes a lot of practice, but by tensing and then relaxing the various muscle groups you can learn to do it. It is a technique I learned (but never got close to mastering) studying Systema where it is used to absorb punches and avoid telegraphing strikes. Works as well with a rifle.