Not hard enough

Guys i have a question and i need answers please. i’m a 22y old guy who had no issue with erections until i couldn’t get it up one time. when i do the exercise, i get hard however its not full hard. it’s about 65% hard anytime i get hard during the exercise. however i get hard 100% when i masturbate with porn which i have stopped about two months ago.
All i want to know is, if im making progress or can i get full hard when i get in with a girl