Where should I cut myyself so it is hiddden?? ?

Right heres the deal as a kid I was abused by my grandad he would touch me and it has all only just come out a few months ago. The stress is unbelievable and its not just thatmy real dad paul is a prick my little sister just recovered from cancer and I get bullied by older sisters who are my mum favourites despite what she says :/ ypu caan say I am stupid but I dont care I have recently just started it and havent told anyone but I get my sharpener blade right a word on myself with it then put a plaster on it. Call me whatever but you cannot understand what it has been liike for me and I know this sounds stupid and youll probably thin no yoour better than this the scars will last forever I know I said the exact things to my friend who is a cutter but it feels better afterwards, you see the blood and I dunno its just better D: so suggestions??