New, In search of help and advice

Sorry if this post is a little long, but here goes. Hey guys, I’m new to this website and forum and generally new to the NoFap concept. I’m a 26 year old male. I’ve only recently started to realize the addiction I have with porn and masturbation recently. I also have just started to realize they may be the reasons for my ED and general poor performance in the bedroom. To start off, ive been viewing porn since I was in my mid teens. When I first started I always felt a sense of shame and guilt. I was a loser who never attracted females attention and as many of you have experienced, it was frustrating navigating sexual feelings and desires as a teen when I was constantly rejected by women. I never really stopped looking at porn from that point. When I was 18, I joined the Marines Corps and started a four year active duty contract. For those of you that don’t know, the Marine Corps as a military branch of service has a very unique culture and sometimes inner counterculture within the lower ranks. Stuff that is typically frowned upon in the civilian world is encouraged in the Marine Corps by those who dominate the lower ranks. The two biggest things are alcoholism and general sexual mischief. Once I was engulfed in this culture, and found that these things weren’t frowned upon, my shame and guilt disappeared and my addiction increased. Watching porn is a past time for Marines. We would sit around and discuss the best models, sites, and share various videos with each other laughing together. I became desensitized to porn. I lost my virginity when I was 21 and it was that first time when I realized that I had a problem reaching climax during sex, I just figured that it was something I would have to deal with. My addiction to porn completely changed my outlook on women and how I approached relationships. I spent 7 years single. Only really developing sexual relationships with women, and too many. It wasn’t until last year when I met the love of my life, and the woman I want to build a long lasting relationship with. Unfortunately, recently I have been experiencing sexual issues that have caused a couple problems. I have been unable to reach a full erection ever since we starting dating and developed an intimate relationship. I still suffer from delayed ejaculation. These issues have caused her to feel like I’m not attracted to her and I can tell it hurts her. I grew frustrated with everything recently and while drinking we were discussing our sex life and I muttered the words “Sex isn’t fun anymore”. I didn’t know how to effectively describe what was truly going on and this caused her to feel that I was losing my attraction for her and didn’t enjoy sex with her. I’m afraid that if I can’t figure out how to fix these problems, our relationship will fail and a marriage with her will be out of question. I’m not sure what to do anymore. I’ve noticed a decrease in libido, and overall fatigue and loss in interest in sex. The worst part is, I have been watching less porn lately and yet if I watch a show with a half naked female, or scroll through social media and see a female that has posted a sexy or revealing picture, I have to masturbate. I’m going to try to attempt a 7 day reboot, but I’m just curious to see if anyone else had experienced these problems while in a relationship and how they improved. Thanks in advance.