Some of my favourite songs are about the normality of life or totally random subjects, not the usual suspects the OP listed.
You already have the subject matter for your first song, a tale of wanting to make a statement to the world but having nothing to say, forcing lyrics from a void, trying night and day, head so quiet it deafens me, screams won't go away, cacophony of silence, wish I could find something to say.
Ok it's sh*t but a song can be about anything at all