Perhaps try the other way around? Find a chord progression; Am, A and G is fine. Strum away and see what sounds right. Hum some melodies over, and see what sounds ok. Sometimes phrases just come. The words you have work with the chords you have, pretty much. Try:
(Am) think I'm seventeen (A) again A
(Am) standing in front of the (A) mirror
(Am) practising my cheesy (A) lines
(G) trying to turn back time
See what comes.