How do you find time to cut your self? My grandpa almost caught me?

I do it in the shower...it gives u alone time and it wipes away the evidence with the water...

ummm well i'm always alone so when i feel deprest a want to cut than im alone cuz my step dad's usually out getting jrunk and my mom is usually doing drugs and getting money frome the streets so i like always have time when i need to.So idk lie and tell them you have an after school thing??