1- Practice masturbating without lubrication. When you notice sensations indicating you are close to ejaculation . . . stop. (You may find it helpful to use thumb and forefinger to squeeze your penis near the base or where the shaft joins the head to delay ejaculation). Pause and wait for sensations to decrease.
Resume masturbation; repeating the cycle several times. Allow yourself to ejaculate, focusing on sensations. Practice several times/week.
Step 2 Practice altering the amount or type of stimulation during masturbation, rather than stopping stimulation altogether. Again, masturbate without lubrication. When you notice sensations indicating you are close to ejaculating, experiment with changing the type of stimulation (i.e., slow down strokes, make them lighter). Goal is to keep arousal high, but controlled. Repeat the cycle several times and practice at least 3x/week.
Step 3 Add lubrication to masturbation to increase sensations of pleasure. Repeat step. above to gain confidence with the same techniques, this time with lubrication.
Try to be patient with yourself, and strive for incremental improvement. (“Perfection” is not a helpful or a realistic goal.) There may be times when you ejaculate earlier than you would like, but this is not cause for alarm. Be kind to yourself and return to practicing the steps