Why Do I Ejaculate Quickly Despite Strong Erections, And Could This Be Premature Ejaculation Even Without Intercourse?

Hi Doctor Iam 23 and I have no issues in geeting erection. I get hard erection. But after getting the firm hard erection just by touching myself or by shaking my manhood I cum too early. I feel like more sensitive on my cock. I can keep my erection for long time . But due to this soon ejaculation I cannot enjoy my erection for long time. I feel like I have premature ejaculation. But I also didn't had intercourse.