Failed at the end of day 5

I decided for nofap challenge to be the best version of myself, to get motivation for gym and friends.
This week I was so strong and my workouts were so intensive, I was really motivated and happy.
Today I stayed at home whole day and I had a boner almost whole day.
I tried not to think about it but I couldn't resist..
I didn't watch porn..I watched videos on youtube and in that one video there was a girl acting naugthy and I started to stroke it but I decided not to cum.
After 5 minutes I could cum x10 but I was still edging and I wanted to stop it but I couldn't..
Just said "fuck it" and cummed... I think if I start again I will be good for next 7 days because I will not have free time but after that it will become struggling..
Maybe I will succeed? My goal is 30 days..for now and if I achieve it, maybe I'll continue counting..
I'm aware of my decisions but I'm frustrated because I'm starting from day 1 again.