Help please

Hello guys I am new to this community. I wasn’t sure where to put my first post so I accidentally put it in the semen retention forum. Anyhow I think this is the correct forum. I’m kind of freaking out a little bit right now so I just need some advice/help. I’ve heard about Nofap for a bit but have not entered the community until today.

Here is a bit of context before I explain the issue:
I first experienced pornography at 13 and since then (I’m 18 now) I have used it off and on for 5 years now. It was not frequent use at the start, but it quickly has gotten worse over the years. I only would see temptations on instagram and that would be the trigger, but now these days it is like I must find pornography to get that dopamine rush. I’ve been half trying to quit for like 2 years now and I started really tracking my relapses since 2022, which my record is only 10 ten days without in the 400 some days I have been tracking. It’s pretty pathetic. I know most guys fap but I don’t know anyone near to me that has developed a pattern of this severity.

The issue:
So, the past few days I have noticed I don’t really get hard like I used to. Even like when I PMO (I think that’s the term for using porn?) I have trouble now getting hard. I feel the stimulation, but my John doesn’t even extend the length it used to. It was like 6 inches if you measure from the shaft to the top, and now it hits 5 even when I get it like semi hard. It doesn’t even get fully hard. I think this is certainly ED. I am freaking out right now and I don’t know if this is permanent or where my length went. I am so naive because I thought ED was like for older people, but I have been humbled extremely. Reading some things online it seems this is temporary? If I complete a reboot it will slowly heal back to normal??? Like I think it’s like a blood flow thing but I’m not sure. Please if anyone knows something about this please help me out! Thank you!