advice from people with good abstinence

i've been struggling with what i believe is porn induced erectile disfunction for about a year now, when I have sex with my girlfriend there's just always a chance i can't get it up and it's so unpredictable but i'm very sure that's down to my porn use since i've watched since i was a kid like most men have can anyone who's been sober for a while tell me if abstinence does eventually rewire your brain and render someone who struggles with ed confident and able to actually get it up every time?