Not sure if I'm doing the right thing

This is day 4 with no masturbation. (I wasn't into porn in the first place). I used to masturbate 2-3 times a day, until I had sex with my girlfriend, in which I couldn't maintain an erection during penetration and I started panicking.

I'm not really addicted to porn, I can't remember the last time I even watched it. I like to rely on my imagination best.
I've been having erections since day 1 or 2 without even touching my penis (whenever I think about my gf). I'm really attracted to her, I'm just frustrated at myself for what happened. Maybe it's the death-grip effect, I don't know. Or, dry masturbation, I don't even know. I'm just into NoFap to regain some penis sensitivity.
I really hope this pays off, cause erections have been popping up after I wake up, and before I sleep really strongly. To the extent that it's a very difficult physical and mental struggle to deal with. I just really hope this works.

 

No, I didn't really use porn. No, this the first time for both of us, which got me really anxious until now.