No I understand, you want to make sure you're not losing hair, we've all been there. But from those pictures too I'd say you're more of a NW1.5 than 2 (although even NW2 would be fine for your age). It doesn't appear that you've got any thinning around the hairline aka miniaturized hair so I'd say you're fine. You could continue using minoxidil to ensure you're doing something just in case you are in the very early stages of hair loss (although I doubt you are).
Also, you said you went to see a dermatologist and you'd actually be surprised at how clueless some of them are when it comes to hair loss, I went to see one a couple of years back and he sat on the fence and said I may or may not be balding and said I should wait it out and take min or finasteride if it continues, so that was a waste of time and money. I've seen others on here also have similar experiences with dermatologists and such.
You said yourself that you only see a few amount hairs on your hairs after shampooing and that you've also always had widows peak, so I'd predict you'll have a full head of hair for years to come. Also remember, there's teenagers with higher hairlines than you so just enjoy your full head of hair.
