The speaker is puzzling over a question that sounds simple but isn't: who am I? Every morning they wake up and go through the day, yet they can't say why they're doing it or what it's all for. The repeated line "It's weird to think" gives the poem a quiet, musing tone, as if the speaker is saying these thoughts out loud while half lost in them.
The second stanza pushes the confusion further. The speaker walks the earth "as a person," but says they don't know the person they are meant to be. It's a gap between the role and the self underneath it, a feeling of going through life without really knowing who is living it.
The mood is reflective and a little lonely, but not dramatic. There's no anger or panic here, just a gentle bewilderment. The plain wording makes the doubt feel honest and easy to recognise, especially for anyone who has ever wondered where they fit.