Scars usually mean pain, but here the speaker reads them as a record of everything that has happened to them. The poem is built like a list, each line starting with "Of," and the list is an odd mix. Hope and love sit beside hate, words and society. Nothing is sorted into good or bad, which suggests the speaker's scars come from many sources at once, not just one wound.
The strangest line is "a knife sharper than steel." A knife can't be sharper than steel, so the phrase seems to point to something that cuts deeper than any blade, perhaps cruel words or the pressure of the world around us. Judging by the imagery, the hurt may be emotional as much as physical.
The final line, "Of a survivor," changes the mood. The poem moves from pain to quiet pride, so the scars become evidence of endurance. The tone is stark and controlled, but it ends feeling strong rather than defeated.