The title sort of sums this one up.
The speaker is a teenager-- he refers to other "kids"-- who is convinced that he is the only one in the world who is not in a romantic relationship: "Everywhere I look, kids are having fun... I'm the only lonely one." Oh, haven't we all been there...
Things are especially depressing on "weekends," when he ends up at "home." But there is a Catch-22 at work here. He can't go to a party or movie or whatever without a date. But unless he goes to social events, how is he supposed to meet anyone?
He's also tired of trying to distract himself: "Getting tired of the radio/ I can't watch another TV show... I might as well go and read a book."
In despair, he turns Heavenward for help: "Lord above, won't you hear my plea/ Send a girl to love me faithfully/ Then I won't be lonely."
The word "faithfully" might be here for two reasons. One is that he imagines a relationship to necessarily include fidelity. The other is that... well, that's why he's lonely. He wants a girl to love him faithfully-- unlike that last one.
Arrangement-wise, it reminded me of a 10,000 Maniacs song, with doleful lyrics set against uptempo music. Musically, it's another Latin-ate number of surprising sophistication, with resounding bass notes alternating with tripping, high, chiming ones. The music alone, which is somewhere in the mambo or cha-cha territory, would have been fine for a big-band dance number in the 1930s,
Next Song: I Wish I Weren't in Love