Erections problems at 20, please help!

Hello everyone. I am 20 years old and suffering from erection problems. A little backstory before I say what specifically my problems are.
As I said I am 20, I am a virgin, and started masturbating at 12 years old. Now I have never been a porn addict, although of course through my teenage years with porn available I masturbated frequently.
But one thing I noticed over the years was that I could not get or keep an erection through just looking at porn, I needed to physically stimulate myself, in other words stroke my penis to achieve the erection. I can only get a semi erection through porn or sexual images alone, I need to stroke my penis to achieve a full erection. Once I stopped stimulation, the erection would slowly vanish until I was flaccid. This is something I have experienced since I started masturbating, but either way I thought it was PIED and have been on and off NoFap for 2 years. I actually completed a full reboot in February, I went 90 days with no porn, no masturbating, no sexual images at all etc. Hoping to cure my erection problems. Nope. After the 90 days were gone I wanted to test my erections, through some sexual thoughts and soft-core porn. It was still the same thing. Nothing had changed. The most I could achieve was a semi by thought or watching porn alone. From then I needed to stroke my penis to achieve a full erection still. I really hoped NoFap was going to cure it, but it didn't. I was sort of aware it wouldn't because as I said I have never been addicted to porn, yes I masturbated to it, but I could go days without masturbating if I was busy and it wouldn't be a challenge. The next big thing is I struggle with getting/keeping erections while standing immensely. It is much harder for me to keep an erection standing up than laying down for example.
Few things worth noting. I actually get morning wood, very frequently might I add, maybe not every single day but for the most part I do. Hardness depends, but usually it is 80-90% percent hard, and when I wake up from a dream in the middle of the night I do notice I have an erection. But here is the thing, right when I stand up out of bed, I begin losing my erection very quickly. Like the blood just decides to leave my penis. And I am left with a semi-erection, similiar to what I can achieve by looking at sexual stuff.
I am healthy, 6 feet tall 170 pounds, eat very healthy and exercise frequently, about 3-5 times a week.
I honestly don't know what to do anymore, I have looked through countless articles, forums, discussions etc. and haven't found anything that cured me. I have tried kegels thinking they would help like a lot of people suggest, they didn't. So then I heard that I could have a tight pelvic floor, so I did pelvic floor relaxation exercises. That didn't help either. I am desperately looking for a solution, I know you guys are not doctors but it doesn't hurt if I try. Any answer is greatly appreciated and I wish anyone who reads this all the best.

 

From what I can remember since I started masturbating at the age of 12. Although when I was really young, like 9-10, before I started masturbating, I remember being able to get erections and hold them without touching my penis at all.

 

Thanks for the reply man, but I definetely feel like I should have better erections. I am sure I will get a definite answer to my erection problems when I start having sex.