just told someone about my self harm

i was walking home with one my friends/someone i live with, after being at a club drinking all night, and we were discussing a bunch of different things and i just kind of blurted out a very basic "this is something i haven't even told Amelia(my best/only friend) before, so basically don't tell any one else please, its gotten to the point where i kinda need to talk to someone about it, ive been self harming for a number of years now," she asked to see so i pulled down my tights and showed her my thighs thus she saw some of my healing wounds, and she asked why i did the things i did and i couldn't really answer because i dont really know myself, we got to the front door and i reiterated the whole please dont tell anyone else ting and came upstairs to have a mini cry and type this out, all the time i was out this evening i kept thinking about how much i just want to go to the bathroom and cut myself but i changed my handbag last minute before coming out so i diddnt have any sharp object's in my hand bag to hurt my self with, which is good i guess, in a way i dont want to keep hurting myself i just cant bring my self to stop sometimes, the only thing stopping me from cutting right now is writing this down right now, Xx