Help! Serious answers, please!?!

Help! Serious answers, please!?

I’m a 25 years old guy and a virgin. I always believed in abstinence but I’ve been masturbating frequently since before puberty –recently almost every day. I’m not trying to be a pervert here.
Problem is, recently, the only way to actually be turned on is by masturbating. I don’t get aroused visually until I start masturbating; I don’t get erection unless masturbating –while watching porn- or when thinking about sex.
I started getting intimate with my GF a couple of times. While she was giving me oral, I was not turned on or get erection, not until I started fantasizing about her and when she was giving me a handjob. I was very stressed too, she’s 9 years older and has great sexual experience. She’s the 1st woman to ever be intimate with. Continued

1 month ago
Before, we used to cyber sex and masturbate and I used to get good erection –she seen it on cam. After, she said maybe cam was lying –it was flaccid/smaller- then she said she was joking. My erect penis size is about 5.5’; girth is about 5’-just in case it matters, sorry if it’s irrelevant. I don’t have erectile dysfunction; I always get and maintain good erection. I’m very concerned I was not that much into porn nor masturbation until lately. I used to be aroused and get erection visually not necessarily by masturbating. BTW, I have a high sex drive.
It’s very disturbing. Is this normal? What can/should I do? Is it going to change if I replace masturbation by real sex? Ladies, would you leave your boyfriend –getting engaged soon- of 1.5 year for this or would you wait for him to be ready? Help and serious answers, please! Thanks!

Usually erection coming from sexual arousal happens by itself during puberty and youth only. Later, as well as the testosterone level decreases, the spontaneous stiff erections begins to be flabbier until to need external intervention.... as like as masturbation or others mechanical actions. That's just is normal! With the age the stiffer erection always becomes more difficult to reach implying time and continuous excitement even if the old man is near a sexy naked woman! If you had problem getting erection overall or ED, then the situation needed an intervention..... but at 25 I think you're almost in the norm!