I'm 19 years old guy! I don't smoke or drink! I've had a normal life till now! But since 3-4 days I'm not able to get a proper erection! Please help!

I would suggest you get checked out by a urologist. We cannot diagnose on the internet.

I would advise a general practitioner before a urologist. This could be due to blood pressure issues, thyroid issues, new onset diabetes, etc. Rule all of that out first.

Cut back on energy drinks and high caffeine coffees, go without porn for a week, and make an appointment with your doctor to rule out medical conditions. Those are the three most common causes of impotence we see. If that doesn't bring you "back to life," continue working with your doctor.

How often do you masturbate? Are you under a lot of stress ? And was it 3 or was it 4 days. How many times did you try ?

You do know, even at 19, sometimes due to medication, or health, or stree, or being too tired, it does not always work