my friend.
i think i share/have shared your frustrations....
my personal experience says...
there seems to be an 'optimal' age difference in my opinion. something like 3-4 years seems ideal.
i came to this realisation when i was 15-16 and the insanely hot girls in my school year were only dating/blagging 17-18 year old boys. then as the years passed, that gap broadened slightly. when i became 18-19 i realised that it was now my turn to get the 16-17 year old girls and so on, then when i was 20-21 getting any girls from ages of around 17-18 became no problem.
I think its just a natural cycle, that you kinda have to wait your turn, and your glory will come!
my problem is coming out the other side. I'm now 24, and beginning to notice that im no longer in the ideal category for an 18/19 year old girl. Although i do beleive when ur into your 20s and even 30s the 'optimal' age gap, broadens quite significantly. I think i have just ascended into a new tier. I'm an 'old 24' as im very tall, mature looking, and completely shaven headed (therapy for going bald) so, i think i am more attractive to girls in their mid-20s now.
I think you need to identify your optimal age group, and adjust to suit. I've given up on teenage girls now, as i dont think they are bothered, and neither am i tbh.
But you're 19, you are very very close to getting into the zone, where you can clean-up with girls aged 16-19.
Good luck my friend!!!
