Atelophobia is the fear of imperfection, and the speaker describes living inside that fear. They call their relationship with themselves "toxic," which suggests the harshest critic in their life is their own mind. The short, blunt lines, like "What I am, / is what I am not," show a self that feels split, as if who they are and who they think they should be can never match.
The speaker is never satisfied with what they do, so they hold back, choosing to leave things "untried" rather than risk failing. The rhymes in the last stanza (do, through, view, you) have a looping, almost trapped feel, like thoughts going round in circles. The final line adds a twist: the perfectionism is tied to not wanting to let someone else down. The mood is anxious and self-doubting, but also honest, since the speaker clearly sees their "twisted point of view" and names it, even if they can't yet escape it.