Can't quit due to confidence issues

Hello, I've been trying to quit my porn addiction, and I've read the Easy Peasy Hackbook many times. But I always encounter the same problem: I find myself folding just a few days after quitting and I come back, due to the fear (and preconception) of failing back into the addiction. I know this sounds stupid, but I request your help, because, for the life of me, I can't kick it, I absolutely hate it, and I know its downsides, whilst also knowing it has no benefits. Thing is, I always fold because I think: "I will fail later, so let's fail now and get it over with". I apologise beforehand for any issue in my English as I am not a native speaker. I eagerly await your responses. Thanks in advance!