A half victory story

Hi everyone,
this is my first thread on this community and first of all I want to apologize if this post is too long or if my english isn't so good, and I hope this is the right section for this kind of discussion.

So let's begin.
I'm 24 years old guy and until two weeks ago I was virgin. I always had problems with girls since I was younger, first because I had puberty late compared to the other guys of my age. I'm not an ugly guy, on the contrary I consider my self a pretty cool guy, not because that's just me thinking it, but because people always told me in these years (no, it wasn't only my family ). I never had a love story at the moment, I had some experiences with some girls but never gone beyond the preliminaries, and just once anyway, with other girls only kissing, my last time before two weeks ago was 4 years ago with a girl in a club. After that absolute nothing, I had some possibilities but I did anything, I had some kind of emotional block with the other sex that it made me feel so ridicoulus in approching girls, and the fact that I was virgin just made it worse, it started to become an enormous heavy for me, also because I saw my friends have many girls, I was always nervous when I was alone with a girl. I'm not such a shy guy, maybe at the beginning, but then after knowing a person I become pretty sociable and companionship.
So after this little introduction about me, now let's talking about the theme of this community.
Of course before become aware of NoFap and all the world behind the pornography, I always masturbated with porn, once a day at least, and one day I questioned my self if this could be a problem for my sexual life, so I started to surf on the web and when I have known about NoFap I started to be docuemented on all the risks and dangers about the pornography, so I'm aware all about this stuff. So I joined to this community 4 years ago and trought these years it was very helpful for me, I changed a lot thanks to all the stories on this community, I started to go to the gym, which allowed me to be much more confident because of my new body since I always was a very skinny guy. But it wasn't enough, despite all the benefits I felt because of nofap, I saw nothing happened, (my longest streak without porn and masturbation was 1 month and 17 days), so I relapsed so many times with pornograph because of course it was the easiest way since I couldn't have a girl, but inside me I knew it was my fault (and who if not), because I didn't even try approching girls always because I felt ridicoulus and all that stuffs I said before. So like I said before, absolute nothing in these years...until this month.
Like a bolt from the blue three weeks ago I met this english girl (I'm italian btw) in this new town where I live in Italy since I moved for a new job.
She was beautiful and gorgeous, and 8 years older , but I wanted to try anyway. I really don't know why, but I felt more confident this time, like never before, maybe because I knew since the beginning she was in game with me, or maybe because I was approching in a different language, I felt more uninhibited anyway.
Without taking it too long, two days later I met her in a bar, and after a walk with her I kissed her, after other two days I dated her in a restaurant, and after that, f i n a l l y, I took her at my home, and it happened...I can't describe how I felt in that moment but it was marvelous, I was so happy that finally happened. But, there is a but...
I knew something bad was happening, honestly I expected to cum after 5 seconds, instead I didn't, at all. It was so frustrating and humiliating that I can't have a fully erection either!! She was awesome, she tried anything but nothing, despite I haven't masturbated for more than a week and I haven't seen porn for more than a month! I felt so embaracced, I had to use my hands to make her feel pleasure, and more I couldn't have a erection and more I became nervous, and so on...
I don't know if because it was my first time so I felt stressed and nervous
I said sorry to her so many times, she was very comprehensive, because at the end I had to say to her that was my very first time, she told me that I had nothing to feel sorry about it and that she enjoined it anyway. So at the end we put our clothes on and I took her at home, so that's why the title of this thread.
The evening after we met at the same bar, we talked a little bit but nothing about last night. After a while I think she got drunk and then she went with another guy .
I knew it that this episode was nothing serious because I knew that after this night I would never see her again because she had to come back in England, but because of that night I admit it was a hard blow for my self-esteem.
Anyway, the strange thing comes now. After that night, I expected to have multiple erections just thinking about it, but nothing, I had a very low libido for many days.
So I tried to jerk off a couple of times always without porn but it was always a forcing, I never really felt the need, I just wanted to prove that my penis wasn't actually dead. Until this morning, I was scrolling facebook and it was enough to see a video of a semi-naked girl riding a bullock to give me the usual strong need to watch porn, but I let myself go because I was curious to see what it was gonna happen, and well, I had a fully erection like never before in this period, and I haven't see porn for almost two months.
This thing is really worring me. Am I so addicted to porn by now that I can't get excited without it? Is this a serious problem? If it is, could I ever totally recover from it?
Maybe I am getting worried to much, because I don't have to put all these thoughts only on my first experience, because I know it was my first time, but I need some answers to these questions, and of course I think this is the right place to talking about it.

I'm sorry again if I has been too talkative, and I thank you to have dedicated 10 minuts of your time to have read this, I really appreciated