once i was a...

first post here, hoping someone here can help me find the song the above lyric goes with,

I'm sure this is a new song, not heard it all the way through, background music in BBC program You are what you wear,

all I heard of song was either "once I was a young girl, now I'm... then chorus starts "We try..

sorry not a lot to go on I know,

please help,

A bit of a stretch but the lyrics remind me of Doris Day's "Que Sera Sera"