I feel like I can understand now why people cut themselves.
Why do you think people cut themselves?
It's because they're in pain. Everyone expresses pain differently.
Even though people have reasons they cut, it is still unsafe. You should get help if you have the urge to cut.
But if the pain goes away, than everything will be fine.
Even if cutting yourself seems harmless, you can end up permanently disfiguring yourself. Moreover, if you're not careful you may inadvertently nick an artery. Talk to a mental health professional to figure out some safer ways to process your pain.