Terrible masturbation habits caused my PIED?

Hi everyone. Not sure if this is the right place to post but I'm 21/Virgin/only started dating and having difficulty getting erections. I only occasionally get morning wood and don't get random boners throughout the day.

Some background: I watched porn and I guess it's became more of an addiction. As a teen (17-18ish) I started watching regular/mainstream porn and as time went by I started jerking it to weirder and weirder fetishes (bdsm,Femdom,pegging,etc). I can now only really get a hard erection when watching these scenes and touching my cock. At my age I should just be able to imagine having sex and I should be hard.

I also have phimosis and its led me to masturbate in an unconventional way. I wasn't able to stroke my cock up and down, the "regular" way as the foreskin couldn't retract and it was painful doing it like that. Instead I just massaged the head of my penis with my thumb in a circular motion with the foreskin covering it. I was able to masturbate and ejaculate while flaccid. I'd been doing this since I began jerking it (12 or 13 years of age). I now realize that this was a huge mistake as it seems like I "trained" my brain that I can ejaculate/get sexually excited without having being hard.

I'm terrified that I did permanent damage to my penis and ill never be able recover as my brain associates ejaculating with being flaccid? Any advice anyone can give me? Anyone else jerked off/ejaculated while flaccid?

Is it as simple as giving up porn/masturbation in general until i'm fully healed? How does the brain start to re-sensitize itself?