How do I differentiate between stretch marks or veins?

Ok the title says it all. How do you differentiate between stretch marks and veins?? Maybe someone with experience in this matter can let me know. From what I’ve read, stretch marks normally run around the girth of the penis?? My situation is I have this line running down my shaft and I really don’t know if they are stretch marks or veins. I have only recently started PE and I’m only into my first week so I really don’t know if I can get stretch marks so early in. Anyone can give me some suggestions?

For the most part my stretch marks are horizontal (width wise). Veins are usually not a straight line. If you can feel them you will feel slight turns in direction even though the overall direction might be straight.

You could try getting an erection and then manually clamping off the base to see if the veins become more prominent. Then try feeling for the line in question.

Hmm.The marks are not straight. They curve slightly, like a very unpronounced C. Is that a good sign that it’s veins?