Is this desensitisation?

Ok, I am a noob here so still trying to figure out things. I have noticed that whenever I try stroking with my left hand, I wouldn't get any erection. Works with my right hand though. I have been vigorously using my right hand in one particular technique for over 10 years now (2-5 times daily). Is this PIED or desensitisation? Months back I was about to have s** with a girl but couldn't get it up. So I am guessing I already have PIED. Will just abstaining help me with this? I do get faint morning wood (not hard but does increase in size a bit).

Please help here brothers. Need your advice to turn around my life.