Masturbation and weak erections!Help!

I am a 26 years old male who has been masturbating since a very young age( maybe 13 years old). I used to masturbate everyday when i was younger, and still masturbate every other day on average but i prolong my masturbation, so i do it for hours. Now my penis has gotten sore and i only get weak erections. I feel like the harder the erection becomes the more sore it gets, so it stays really soft. I know that my Erectile Dysfunction is because of over-masturbation, and i have read many articles about it's affects, but no article's i have read have answered this. Will i be able to cure my Erectile Dysfunction? If so, how? I have also read elsewhere that over-masturbation can permanently damage your parasympathetic nervous system, but how much masturbation can damage it? and how do i know if that's my case? Please help, i want to get married soon and want to know what i can do to get my erections back