Unable to maintain erection without physical stimulation

Hi guys , I?m  22 years of age , muscular built about 6?1 tall.  I started watching porn at the age of 16 without masturbation , started masturbating with porn at the age of 18 .I?ve been on and off porn for about 8 months now. I?ve notice for about 3 years now that I could get an erection with physical simulation but can not maintain it with just mental stimulation, with or without porn .When I?m in the presence of a girl , my problem seems to get worse. I?ve went to the doctors and had several test done , apparently I am healthy and everything is fine. Doctors can not identify what the man cause is, this is frustrating and I?m worried . I?ve not had morning erections for about 3-4 years now ever since I started masturbating. I?ve tried herbs like Maca , Tonkat Ali , Ashwaganda , Mucuna and more and still no change . Although I always seem to have the desire for sex, I just can not maintain my erection when I get hard, as if I kinda loose interest within few minutes of getting an erection. Once in a while I do experience random erections or when I think sexual thoughts but can never maintain it and dies within seconds. Last year I tried to have sex with my girlfriend which my doctor prescribed me some cialis , which seemed to work fine not the best, tried the cialis once again about a month ago which I noticed this time I could still get an erection but can not maintain it . I thought I?d give nofap a try since there really isn?t any other option. I?m in my second week of nofap , please let me know what you guys think about this and what might be the real cause here and if any of this is normal , also if any of you is experiencing the same issue.

Hi James,
When you say "on and off porn for 8 months", what exactly do you mean? About how often do you go without looking at it? and when you do get back into it, how long does that usually last? once a day for a month? once a week?
Your symptoms suggest PIED - porn induced erectile dysfunction. But knowing your porn habits might help us give you some better advice.

Get off porn completely and don?t masticate for 3 months. In the meanwhile practice presence when you don?t need to use ur mind, don?t. Sex is something purely physical and not mental process. It?s not your mental images that keep you hard, it?s physical senses that increase the blood flow so your going to your head actually is your problem. David deida meditation is very good at teaching you to be present. You will experience  internal ejaculation than external witch add quality to the experience in oppose to wanting to imagine it. It?s more like driving a Ferrari and imagining that you are driving a Ferrari

Sex is also mental - whether psychological or structural. It's not all about the physical.

> please let me know what you guys think about this and what might be the real cause here and if any of this is normal ,

It does sound like you have porn-induced erectile dysfunction, but I think you already knew that (if you came here). The cause is obviously your pornography usage and masturbation.

I have very similar problem symptoms.

The solution:
1. Stop looking at porn or any artificial sexual stimuli -- this includes soft-porn, fantasies, etc. For the rest of your life -- not just 3 months.
2. Stop masturbating.
3. Stop taking any ED drugs. The problem is mental, not physical.
4. Direct your energy elsewhere -- exercise, faith, whatever.

In time things will get better.