Your story is actually very typical.
Many heavy porn users share your inability to get an erection without porn - and sometimes with porn. The inability to get excited by a real-life sexual partner is called copulatory impotence. Chronic erectile dysfunction is a rare problem for men under 40 - or at least it wasn't until Internet porn arrived.
Over the last 5 years we have seen hundreds of men on our porn recovery forums with ED. Many in their teens and twenties. They stop porn - and limit masturbation - and they slowly recover their libido and erectile health. Most health professionals are unaware of this rapidly developing problem.
The problem is in your brain, not your penis. ED caused by porn is not psychological, it is structural and biochemical.
Internet porn can become an addiction, and with all addictions the brain changes, or adapts. It does not matter if the addiction is to a substance or whether it is a behavioral addiction, the same brain changes result.
Today's internet porn is nothing at all like our ancestors ever encountered, with the constant novelty and genres of extreme porn. Unlike yesterday's Playboy, Internet porn overstimulates the brain structures responsible for libido, erections, and addiction.
Brain changes include a drop in dopamine receptors in the reward circuitry. Reducing the amount of dopamine receptors decreases your pleasure response to "normal" stimuli. In other words, real-life sexual partners and previous porn won't excite your brain enough to get your penis going. Turning on dopamine receptors is how you get turned on.
Here are two excellent presentations, by a science teacher, on the effects of pornography on the brain. They are non-religious, non-judgmental, and science based.
Erectile Dysfunction and Porn:
http://yourbrainonporn.com/erectile-dysfunction-and-porn
Your Brain on Porn - Porn Addiction:
http://yourbrainonporn.com/your-brain-on-porn-series
Here are two articles on porn-induced ED
“How I Recovered from Porn-related Erectile Dysfunction”
http://yourbrainonporn.com/how-i-recovered-from-porn-related-erectile-dysfunction
As Porn Goes Up, Performance Goes Down?
http://yourbrainonporn.com/as-porn-goes-up-performance-goes-down
Knowledge is power,
I would also like to say I will be 53 in a few months and have just left my wife. I feel she might have caused this from not being able to have sex for so long she wouldn't take care of me in any other way. I went to porn and am not sure if I am addicted or not.
Please help me. I still have feelings for her but not sure if it is love anymore. I know she would stand by me no matter what the problem but feel I would like to try with another woman to see if it would work with someone else.
If not I guess I will be alone for a long time to come. I haven't been with anyone else yet and still consider my wife my best friend.