Need your advice in passing the first few weeks

I've had enough, willpower alone doesn't help me

The first step i've taken is to have my close friends to support, and then what should i do?
I often failed on the first few days, especially on day 3-5 where i struggle with intense cravings / urges

What should i do? I have a weird fetish that is difficult to control, height fetish. I know that is weird, which is why it appears on my mind very often and i don't need the internet for it to trigger. I don't even watch P video ever since my first PMO, just images and fantasies. Mild trigger already cause intense cravings too

Should i plan out the whole first few week? I'm still 18 and planning the whole week is a whole new thing for me. College is 3 months from now, and I'm really hoping on this

I've done a few calisthenics exercises but that's it, i don't even know what else to do after that

The only problem in my life is literally PMO addiction. I know it causes most of my mental issues too

Any ideas / advice? Like what should i do on the first week where urges is at its peak?