Hello Sir, Iam 25years Old Unmarried Guy . I Wanna

Hello sir, iam 25years old unmarried guy . I wanna ask some queries related to my erections.
Sir i have been musterbating and watching porn since i was 13 years old almost daily on each day. Earlier i use to have normal erections without any stimulation. But now it has become a problem. Even today "SOMETIMES" i get morning erections as well as erctions on other time of the day but they last for very LESS period of time . Sir i get erections only for 6 to 7 SECONDS. Yes sir i repeat only for 6 to 7 seconds after that my penis gets flaccid/soft. And iam not nervous or anxious at the time of my erections so it is not psycological for sure.
On the rest of the day even if i have an urge for sex , my penis dosent get erection. It get erections when i stimulate it with my hands but that to for a short period( 6 to 7 seconds).
My penis dosent at all get erection when i fantasise.
Sir, i wanna know that is it porn induced ED or it is something else...???
Sir recently (1 weak ago) i have stoped my musterbsting habbit and also stoped watching porn.
I wanna know that i should completly stop musterbating or i should do it ocassionaly???. Are there any negative effects of NOT musterbating.....???
And one more thing ..please tell me what are blue balls and when doest it occur???
Sir, i would be glad enough if you take out few minutes of your precious time and answer my questions.....
Thank you.