This is my background:
I watch porn, maby every second day and masterubate 2-3 times a week.

When I try to measure/stop stroking, its semi erect by the time the ruler is at the right place, and if im not start to stroke it agien it will be flaccid in like 5 seconds.
And most of the time the erection is pretty soft.

I have imbalans in the immune defence at the moment, maby thats the reason, or is it mental


What do you think, is it common for a 19 year old ?

Does someone know what the cause can be and how to make things better?

Hope you understand my english