Do you self-harm?

I would never harm myself on purpose and you shouldn't either you are obviously not the only person getting hurt by doing that to yourself. :(

No, I never have.

Yes, sometimes. But, it's very rare.
People self-injure in order to:
distract themselves, alter the focus of their attention, or regain control over their minds when experiencing pressing, unavoidable and overwhelming feelings or thoughts
release tension associated with strong emotions or overwhelming thoughts
feel something physical when they are otherwise dissociated and numb
express themselves or communicate and/or document strong emotionsthey are feeling and cannot otherwise articulate
punish themselves
experience a temporary but intense feeling of euphoria that occurs in the immediate aftermath of self-harm
People sometimes harm themselves because by doing so, they are able to gain a subjective sense of control over chaotic internal emotions and thoughts. Seizing this control involves shifting the focus of their attention away from something more troubling towards something less troubling. Cutting or burning one's self causes physical pain which is a very compelling and strong sensation. Self-injurers sometimes use this pain sensation to override painful background chatter that fills their minds. For example, they may have been traumatized by a rape experience such that they have PTSD symptoms and constantly be replaying that rape in their minds. By cutting on themselves, they are able to refocus their attention on the pain of the cut and for a short while, experience relief from the rape trauma.

Nope but i'm glad that you have a friend that supports you.

You should be happy with your life even if it's not the best, once you're parents or friends see them they'll think you're trying to commit suicide.

I tried once, but I failed. I have a faded scar on my wrist .

No,you shouldn't either!You see how much your friend cares about you - by harming yourself, you are harming your friend too!