Erectile dysfunction due to porn, over-masturbation and tight pelvic floor(?)

Alright,
First, let me say this: take a deep breath, and calm down. You're going to be fine, and nothing you've described here is unheard of on this board. Or on most medical board dedicated to sex issues. It's just that you haven't managed to find similar cases.

Let me enumerate the elements from your post that I've definitely seem repeatedly:
- porn use for years and starting young
- trouble maintaining an erection in some position (particularly, standing)
- tense pelvic floor
- occasionally compulsive masturbation

You're young and healthy, this is nothing to panic over.

Sexual arousal is very susceptible to reinforced learning. In other words, you've probably spent most of your sexual stimulation experiences laying down or sitting. Your brain isn't quite sure that standing or kneeling are positions that have anything to do with sex.

The approach I've seen to this (and which makes a lot of sense to me) is to train yourself to perceive these positions as plausibly conductive to pleasure: start by jerking off, then when you're nearing climax, move to your knees or stand, and climax in that position. No need to force yourself to do this every day, just start doing it reasonably often. And relax about it. It's totally possible that you'll initially try it and fail.

Just forget these worries about the thing being unfixable and stop thinking you need to make it work asap or it means your life will be miserable. You're fine.

The endless drops of pee issue can indeed indicate a problem with the pelvic floor. And yes, it is possible that it plays a role with your erection. But again, no panic. This, too, is fixable. If you search online a bit, you can more than likely find online consultation with a physician for a pretty small bill. I know I was able to find a french site that provided consultations for about 40$ (but it's in french). No doubt this exists in english as well.

Try to reach out to a proper medical resource so you can get an accurate assessment of your pelvic health. Other than that, again, just relax, give yourself time, and try this thing I mentioned to train yourself to feel pleasure when standing. And, I repeat, give yourself the right to fail. It'll work in time, but stressing yourself out over it won't help.