Didnt get hard on 2 occasions

Im 15M still a youngin i still feel the desire to go get pussy i think about it everyday so i know my sex drive isnt gone but sometime in may a girl came over and i couldnt get hard

ever since then ive been regularly “testing” myself since that time in may every 5-6 times out the week to see if i could get hard using porn and masturbation and i still can but when Im with a girl my penis didnt react honestly feels like i can answer my own question but im still new to this sex stuff bruh i just wanna be able to have intercourse again