The speaker is a young person who is treated unfairly because of the colour of their skin, and the poem follows how that feels over a few minutes. Anger comes first, then crying, then a forced smile that nobody notices. The speaker wants to ask why they are treated differently, but their parents are out working, so the question stays unasked and they have to think it through alone.
The mood is sad and lonely more than furious. The anger fades quickly, leaving hurt and confusion. At school the speaker sees everyone staring in the hall and notices them even when they try to hide it. The ending is the strongest part: the speaker says they are a person just like everyone else, then asks whether anyone truly looks the same in the end. It is a simple, honest question that makes the unfairness feel even sharper.