happy that you're trying to get better and sorry for the obstacles you're facing.
the emotions regarding anger arise when we just get and feel frustrated about life and everything in general. usually the people that are the most negative, bitter and angry are broken and thus are inflicting this negative energy there feeling into the world and onto others, because it feels good, because there in control and power, and feel unstoppable, completely different from how they feel alone, when all they feel then would be weakness, isolation, powerless, etc. frustration about lets say things not getting better, or something that happened that triggers you're suicidal ideation would lead to anger, like things arent getting better, why arent they getting better, leading to then our suicidal ideations of wanting to hurt ourselves to feel this pain and hurt, feel something other than just either anger or nothing at all. or we feel like we deserve to be punished and thus cutting feels good in a sense and is a coping mechanism for some.
i'd suggest perhaps channeling this anger that you're feeling. when you get angry, what's the first thing you think of doing? hurting yourself, wanting to die which leads to resorting to methods like cutting. try and force yourself to place this energy of negativity and anger focus it onto something else. for example, hobbies; working out, taking on boxing and just literally punching a boxing bag and letting it all out. it doesnt seem like it helps, but it does. even just crying and screaming into ur pillow, let it all out and channel this emotion and focus on alternative sources to let out this energy like the gym rather than cutting.