Scenes donât have to be 100% realistic, but they have to be believable and relatable. Reading educational articles about depression can be helpful, but it doesnât necessarily help write interesting stories. (Anyone who is sensitive about self-harm, donât read this post.)
I have some questions that might help you design the MCâs mental state and make the self-harm scene more powerful. You donât need to include answers to all these questions in a scene, but itâs still good to know things about your characters behind the scenes.
Disclaimer: Iâm not a mental health expert.
The MC cries, but we donât get to see the details of her emotions. Her emotions are very important, because theyâre the central motivation of the scene. Does she hate herself? Does she actually want to cut her abusive father, but misdirects her anger at herself? Does she feel hopeless? Powerless, unable to control herself? Powerful? Is she angry and wants to âpunishâ herself? You can describe her emotions in more detail. One nice way to describe emotions is to use metaphors, as if her emotions are tangible beings or demons that attack and manipulate her, because her emotions can feel as huge and unmovable as mountains to her.
You wrote that she hurts herself to feel alive. If itâs her core reason to self-harm, it stills should be expanded more, because currently itâs kind of abstract and difficult to understand. How does it make her feel alive? Is she a masochist or adrenaline junkie who gets excitement from pain/danger? Does she like having physical scars that match her mental wounds? After cutting, is she relieved that she didnât kill herself - letting her appreciate her life at least a little? I personally donât recommend making her desensitized and self-harming just because of routine, because it prevents you from getting the full emotional impact of the scene.
You can also describe how her emotions make her feel physically, for example her heartbeat increases, she breathes faster, she feels nauseous. Physical descriptions are easy to relate to. Theyâre also relatively easy to write: just think about the saddest/scariest/most painful moment that happened to you and how you felt then, but exaggerate it until the description fits in the scene.
You can also use the environment as a tool to describe her feelings; does she for example feel safe in the bathroom, locked away from the evil world, or does she feel trapped? Does she feel ashamed that sheâs self-harming in a friendâs house and might be caught, or does she feel betrayed and lonely because her friend doesnât notice and doesnât come to protect her?
You can also add some action to the scene, so that it doesnât become 100% descriptions of emotions. She can throw insults at herself. She might also have flashbacks of something bad happening to her. She might imagine herself in nightmarish scenarios where all her hopes and dreams are crushed permanently. You can use the scene to show her worst fears and the deepest darkness of her mind.
Of course you can also describe the act of violence in more detail, but the characterâs reaction to it is more important than the act itself. You can show a lot of information about the character. Why does she always use a corkscrew? Does it have special meaning to her, or is it just the most convenient tool? Does she harm herself aggressively or carefully? Does she have a pattern or is it random? Is she worried about cutting too deep, or does she want to push the limits for some reason? Is she confident that she can cause herself the exact amount of harm she wants, or does she like gambling with her life? What would she do if she cut a big artery - would she tell Emma or let herself bleed out? Does she fantasize about almost dying and being saved by someone (because it would prove someone cares about her enough to save her)? Is she grossed out at all, or did she use to be squeamish in the past, but isnât anymore? Does she harm visible body parts (for example wrists), only parts that can be easily hidden (shoulders, thighs) or parts that will never be seen by someone accidentally (chest)? Does she react to the pain by for example almost shouting, or does she just shrug it off?
Why does she want to hide her self-harm from Emma? What does she imagine would be Emmaâs reaction of she found out? Does she think Emma would be angry/disappointed at her and would stop supporting her? Does the MC think Emma would consider her weak and broken, and doesnât want Emmaâs pity? Is she scared about being forced into a hospital?
I, for one, think the story isnât too dark and edgy. Nothing is ever too edgy for me⌠I guess Iâm one of them edgelords 
One more idea: something that could prevent the MC from going to the police could be that her abusive father is so charismatic and manipulative, that he could easily convince everyone that heâs innocent. Even worse, make him such a good liar that he could easily make everyone believe the MC abuses him, and not the other way around. The father could be a âmodel citizenâ and loved by the community on the outside, but in the privacy of the house he would become a narcissistic monster. The MC, on the other hand, would be seen as an unstable, unemployed and unemployable rebel by everyone except Emma. People would think her father is working hard to take care of her and that sheâs just ungrateful, because they donât know what really happens. If she showed the bruises from the beatings to anyone, sheâd be told she probably caused them by self-harming.