Annie is speaking to a boy she has never really spoken to. She has given him a private nickname, "Blue Boy," and the poem opens with her introducing herself as if she is finally saying hello, even though the hello only happens on the page. The detail that matters most is the counting: this will be the seventh time they ride the bus home together. She has clearly noticed every one of those trips, which tells us how much he occupies her thoughts.
What she feels is a mix of longing and frustration. She hopes he will make the first move, pleading with her eyes because she can't use her voice. She asks him to have "the courage that I do not have," which is both a little unfair and very honest. The closing question, "What's a shy girl gotta do?", is playful and a bit helpless. The mood is light, sweet and slightly awkward, the kind of nervous crush most readers will recognise.