Here are several, if you're alright with Vocaloid songs (I'll put this into multiple messages due to limitations with how many links I can put in one post).
Tawagoto Speaker mostly centers around abuse, but it also hints at self-harm and suicide.
Rolling Girl's true meaning is up to interpretation, but the most common theory is that she commits suicide at the end/gives in to her depression.
I highly recommend Wrist Cutter. Though how it sounds may not appeal to everyone (it took me a bit to start appreciating it), its lyrics are beautiful and relatable.