Help

Hi Everyone,
I have created an account just today for the sole purpose of getting some help on here. I have struggled with challenging and attempting to stop my PMO addication for quite some time now ( am 18 and first encountered P around 13 and it became a problem early last year) and it seems no matter what I try or how hard I try it always seems to make a return.
A little about me: 18, M, play and love basketball, pretty intelligent, studious, generally ambitious and pretty social and well connected but unfortunatley single.
Now to the addiction. I get to the point I really want to quit and I mean reaally want to quit, I know the harms, I know all the damages and have put all the precuations in place, filters on not only my main browser but all three and my phone, restricted browsing time, mimismised youtube and instagram consumption, attemped to make rules to stop it from happening e.g no phone in toilet, no laptop after dinner, got an accountability app on my phone, made a list of reasons to quit, watched every video under the sun to get educated and find stratergies and it just always seems that this addicted side of me always gets the better of me, part of me just feels like theres no point and I'm too weak to even bother fighting because its only a matter of time before I relapse.
Everywhere I seem to look a trigger pops up e.g youtube, instagram or just a stray thought as I am going to sleep of "i wonder what..." "you think they have...." "woudnt it be sexy if..." frankly I'm pissing myself off. I really want to free myself from this and have commited myself through both prayer and action but my willpower always seems to be diminshed by the intense urge and the stupid belief that "I'll just look at" or "I bet I can find P by searching....", particularly things like google images and instgram exlpore which act as a P substiute, don't tend to go directly to P.
I have finished school now so I thought it would be easier when I didn't have to be always studying at my computer alone but now with all the spare time it seems just a matter of time before I get lured in.
I really need an alternate perspective and to seek someone because I can't seem to tell anyone because of the shame that I feel. Usually I'm a really open dude and aren't afraid to talk things out but for some reason this is different. I hate being like this and I really want to change, please help!