If I don't fap in a week or more I go to the gym and thats it. But if i jerk off that week are so I can't even lift. I am so fucking tired I just don't wonna go to the gym at all.
This used to happen to me a lot. The gym is a big part of my life and it was super frusterating to give in to my urges and then go and perform terribly when lifting. This is what makes it an "addiction"! The fact that it ruins other parts of your life should be even more motivation to stop!
Has happened to me too. It only won't affect working out in the gym, but other aspects too, for me it affects creativity and motivation the most.
Make yourself go. Even if you just fapped. It will suck at first, but it will get you in a new frame of mind. Lifting has replaced PMO for me. When I lift a lot, I have no problems. When I don't lift, I mess up.