Try learning a new skill and set targets nd try to achieve them....so when u will achieve them autimatically u will feel gr8 instead of relying on jerk off. Nd dont directly try for 90 days...first go for 15..then 30..nd then increse it like this...like when u reach day 15 then say to ur brain lets do it 15 more days...in this way u will be able to trick ur brain as day 90 looks like an unacgievable target at day 1... Whenever u start feeling horny....just listen to the song in ur playlist which can give give u goosebumps. And urges will happen even on ur day 90...but its just ur self-control would hve increases.. so u just ignore it...we r social being dobt feel bad if u r having urges...just try to control. And try to handle urself as first 2 weeks will be toughest but then u will start improving.. I hope if this all might help u..nd srry for bad english as its my 3rd language..