Recovering from 5 years of Prone

Hi Guys. I wanna share my experience with something that's haunted me since I was 12 years old. I'm now 17 and paying the price, but have made a major leap in quitting prone.

It has been just over 5 years of masturbating prone. I have been left with mild ED and severe regret, which constantly haunts me.
I have really started to feel the effects this year, the most noticeable and horrifying things I have noticed recently were:

• A decrease in size, likely due to weak erections and strain.
• Difficulty to sustain an erection, it soon disappears or can't reach more than a semi
• No longer able to get hard over girls I find attractive and things I once really liked (Porn and Prone are to blame here)

At 16, my erect penis length was about 6.5 Inches. I took this measurement numerous times to certify this. It is now a touch above 6 inches on a good day, and 5.8 on a bad day where I struggle more. I can see that my erections are really weak and not anywhere near as strong as before. I blame this for the loss of length.

However, today I made a major leap. For the first time in my life, I managed to masturbate using the conventional method. I discovered a site called HealthyStrokes. Whilst I want to stop Masturbating altogether, I thought I would give this site a try and see if I am able to at least improve my situation and learn how to ejaculate normally. After around 25-30 minutes, I was able to masturbate normally. Whilst my erection was not up to its full size, it definitely felt better.

I plan to abstain for a week now and follow the guide of this site. I then plan to quit altogether as I will be better off than before and want to clear my mind.

My real question is, will I be able to get back to my original length of 6.5 Inches if I follow this guide and then NoFap? I know NoFap isn't all about this, and having a healthier mind is vital, but I want my sexual health to be tip top. I don't wanna be a virgin my whole life who can't get a full erection or has to rely on Porn.