I'm scared my parents will see my cuts, what can I do?

Ok, first of all, please don't go on about the risks of dying and other things from cutting oneself, I know every little detail of it, and know that if I cut a vein I bleed and so on. Anyway, lately I've been very depressed and for the first time, I cut myself with a x-acto knife (I think it's called that), but fear not, I don't cut my wrists, but I make horizontal cuts below my left thumb. The thing is, right now, I'm in fear that my mom or dad will see my cuts and think I'm doing it 'just for the heck of seeing blood drip out' since they don't know that thier shouting and disagreement towards each other and attention I never had in school is doing this to me (I tried all I can making friends, but I had no luck). And also, I don't go to school, I home-school so I can't speak to a counsilor or anything. What shall I do? I love my parents a lot, but right now I feel very depressed. Should I show my mom the cuts and tell her? If you want me to do that what shall I say? What shall I do?