Erectile Dysfunction Forum - unable to sustain erection

I am 27 years old, and I have been suffering from Erectile Dysfunction for about six years. I can honestly say that I have not ever performed sex, successfully. Up until the age of 21, I feel I was fine. I dated different women during that time, but the relationships didn't go that far (but they were oral). When my gfriend at the time performed oral on me, I was totally fine with no problems. The first time I attempted sex, I was 21 and with a girlfriend (who I wasn't fully attracted to). It failed on me, but I brushed it off as me not being really attracted to her. A few months later, with another girlfriend whom I was very attracted to, it failed yet again. This has been going on for years, with many attempts with eight different women (some were girlfriends, some were vacation flings). My ED problems include not being able to erect 100 percent, not being able to sustain it, and delayed ejaculation.

I am in a very great relationship with a super-attractive and supportive girlfriend, but I feel terrible that I can't satisfy her. I know it bothers her that we can't have sex as she is ("was") a very sexual and passionate girl. I feel as if my ED is lowering the quality of her relationship. I have accepted my ED, but I feel for her. I went to my family doctor, and he brushed it off as nothing. I went to a Men's Clinic, and they prescribed me Viagra, Cialis, and Levitra. These help in somewhat sustaining it, but not really. It is my libido that is the real issue, I think, and according to the Clinic, they say my penile blood flow is totally fine. They checked my hormones, and the results, according to them, are fine too:

Testosterone-Free: 42.6 (Range: 31-94 PMOL/L)
Thyrotropin (sensitive TSH): 1.26 (Range: 0.35 - 5.00 MIU/L)
Lutropin (LH): 4 (Range: 2 - 6 IU/L)
Prolactin: 11 (Range: 2 - 18 UG/L)
Glucose-fasting: 4.2 (Range: 3.6 - 6.0 MMOL/L)
Creatine: 94 (Range: 60 - 125 UMOL/L)
eGFR: 95

I asked for them to further test my hormones, such as DHT, Total and Bioavailable Testosterone, DHEA, Estradiol, Estrone, SHBG, etc....but they said that this is the standard test that they do, and that testing the rest of these hormones is unnecessary. I voiced my displeasure my asking them how they can possibly believe that a man in his mid-20s who has ZERO history of any drug use, smoking, and poor diet could be recommended to just use sex drugs on a basis (Levitra being the only one that kinda works). He just said that it was psychological, and that's that.

I can understand that, but I wake up every morning to ZERO erections. I never get spontaneous erections, and even when I mastrubate, my penis still fails on me! It gets hard, sometimes it can get to full erections, but quickly subsides and then it ejaculates a lot later, after it already becomes flacid. I want to go to a urologist, as I think it's more than just performance anxiety. But I simply don't think the urologist will tell me anything different than what the Men's Clinic has told me. I am seeing a Homeopath, it's good to talk to him, but I don't know if he can help me either.

What disease could this possibly be? Peyrone's? When I mastrubate, many times, I am not feeling it. I ejaculate with no pleasurable feeling many times, and a lot of times I don't feel much as I am thrusting. Could it be nerve damage? I am circumsized since birth, so that could be an issue. I'm out of options.