I have quit porn but struggling to stop fapping

Hi guys. I really need your advice to stop PMO.

First, a bit of a story: I have been into this predicament since I was first introduced to porn in senior high school (I was 16)... Now 7 years later, being 23, am still struggling on quitting PMO, especially the MO part.

I have been doing it almost every night ever since. It became a habit, even an excuse, to get myself to sleep. My mood swings time to time, I have never been able to maximize my focus, and I just feel dumber overall. I assume the root cause of it is my PMO habit.

Lately, I have started to take control of my actions. I have been watching less and less porn, yet am not sure if it's really because I finally got things in control, or I just got bored of it and can't find anything good/new about it.

Yes, sure, I've been watching less porn... but the struggle of leaving masturbation out of the equation still goes on.

Whenever I decided to stop watching porn, something else takes its place. I really feel like a disgusting human being for doing this, but the absence of porn always pushed me to fantasize about my close friends. I somehow still manage to have a somewhat good relationship with them, but I can't help to feel repulsive about myself whenever it comes into my mind. I really don't want to think of them when am doing it, but it just happens.

Then, a couple of years back, I ended up having a girlfriend (and we are still together now). I expected that having an actual partner might help me fight the habit, but I was still struggling. I still happen to watch porn every once in a while, and during the downtime I still went to fantasize my close female friends, with the addition of my gf among them.

Now, for context, my gf is raised in a very religious family and we are not allowed for premarital sex, plus we are also in a long distanced relationship for most of the time due to my work. I think I have managed to reduce watching porn even further (from 5 times a week to once in 2-3 weeks), the fantasizing of close friends happens less, but another problem occurs: I became addicted to my gf's nudes.

Although my gf have stopped sending arousing contents, I still can't get hold of myself to look back at the older photos and videos she sent me. It kinds of becoming a new bad habit. I rarely watch porn and fantasize about my friends now, but I do keep masturbating to my gf pictures every few days for the past year. She knows about this (obviously not the part of me fantasizing about my friends) and really wants to support me but she doesn't know how. I really tried the advice of getting rid of her arousing photos, but push come to shove, I can still either fantasize about her or just jerk it out of her profile picture or Instagram photos.

I really... really want to stop before it becomes too late and ruin my life further, but it is really hard to control myself especially that I live alone with a long distanced relationship.

I really need a slap in the face advice on this. I really want to go to a therapist but I just don't have the courage to, I feel very embarassed about it, and I keep making the excuse of not having enough money to go.