I have never been able to climax during sex. Is my masturbation style to blame?

Sex with my first partner has been great for both of us, but I would like to learn how to become a more satisfied and satisfying lover I am an 18-year-old man and recently lost my virginity. I have been sexually active with the same girl since. I have never been able to ejaculate during sex, even though it has been great for both of us. I decided to research the issue and now believe it has something to do with my masturbation style, which is typically pretty fast, and unrealistic to replicate d...