The speaker looks back with a rueful kind of regret. She lists the classic wishing rituals: blowing a dandelion, shedding an eyelash, blowing out a candle. She says she has used every one of them on "boys like you." The wishes were meant to win someone over, but the poem suggests they were aimed at the wrong person all along.
The twist comes in the last lines. She admits she should have been wishing for someone "completely the / opposite," and the line break after "the" makes the word "opposite" land with a small thud. It reads like a sigh, or a lesson learned too late.
The mood is quiet, wry, and a little sore. There's self-mockery in how many wishes she wasted, but also a hint of hurt, since "boys like you" sounds like it's aimed at someone specific. The childlike wishing games make her hope seem sweet, and also a bit naive.