"Fell in Love with a Girl" is an uptempo alternative rock and garage punk song that runs for a duration of one minute and fifty seconds.

It is built a slashing rhythm guitar groove set to a high-speed, stuttering beat with thrashing crash cymbals and skipped snare drum.

[3] "Fell in Love with a Girl" is composed in the key of B major, while Jack White's vocal range spans from a low of B3 to a high of A4.

Comparing it to that of the Ramones, Tom Maginnis from AllMusic called it "an attention-grabbing chunk of primal punk rock confection that flames out in a breathless one minute and 50 seconds.

... Surrendering is the only option; to fight against the infectious brutal and relentless energy of "Fell in Love With a Girl" is an exercise in futility.

"[7] The Village Voice's "Pazz & Jop critics' poll named "Fell in Love with a Girl" the sixth-best song of 2002.

"[13] Entertainment Weekly included it on its end-of-the-decade, "best-of" list, saying, "An idea so simple it's a wonder no one thought of it before 2002: rock & roll Legos!

In 2003, English singer Joss Stone covered the song, retitled "Fell in Love with a Boy", for her debut studio album, The Soul Sessions (2003).

Dorian Lynskey of The Guardian raved that "Fell in Love with a Boy" is the best track from The Soul Sessions as well as "the freshest and most deliciously inauthentic.

"[27] PopMatters reviewer Jason MacNeil commented that Stone gives the song "a groove-riddled, funky hip-shaker that never loses momentum.

[30] Andrew McGregor wrote for BBC Music that it "blends so well into the funky soul landscape that those less familiar with contemporary rock might miss the ironic juxtaposition altogether.