Told in short, flat lines, the poem seems to follow someone standing on a high bridge, thinking about stepping off. The speaker talks about "her" in the third person, then admits that "no one knows her but me." That slip suggests the speaker is really describing herself from a distance, as if she can only look at her own pain by treating it as someone else's. The line "as long as knowing yourself counts" is a quiet, bitter doubt: does self-knowledge mean anything if nobody else sees you?
The feeling is loneliness and numbness. The speaker believes nobody would care, and the long roads leading "to nowhere" make life seem pointless. The joke that it's good she doesn't know where she's going is dark and tired rather than funny. The mood is hushed and heavy, and the repeated "one step" gives it a pull toward the edge. The ending, "Just one more step...", trails off unfinished, leaving the reader uneasy and wanting to reach out to her.