The speaker describes getting through pain completely alone. Every line is a small act of self-care: feeling the sadness, crying, wiping away their own tears, then finding a way to be happy again. Nobody else appears in the poem until the last two lines, and that is where the mood turns.
"Don't you dare to help me, / If you can't" is the sharpest moment. It sounds defiant, but it also hints at disappointment. The speaker seems to have been let down before, or offered help that wasn't real, and would now rather rely on themselves than hope for support that might not come. The warning isn't against all help, only help that can't be followed through on.
The mood is a mix of pride, loneliness, and toughness. The short, plain lines and the repeated "my own" and "myself" make the speaker sound steady and guarded, as if they have learned to protect themselves. It's a strength, but a slightly lonely one.