it can be really tough on parent, the reason being, they are probably wanting to help you, but not knowing how. Therefore they stumble around and do what they THINK is best. The fact that you self harm means that something is wrong. It's not the self harm that is necesarily upseting, it's the reason behind it. That reason is there, and they know it, whether you talk to them about it or not. If you don't, they may feel clueless about how to help you, and worry about you. If you do talk to them, and tell them everything that's going on, then they will have a better understanding, they can support you when you need it, and although it will be upsetting at first, they will learn to deal with it, and be happier knowing that they are supporting you.