Lyric discussion by thebodiesobtained 

Cover art for Seventeen lyrics by Love Spit Love

I think seventeen refers to age, as in being seventeen years old. A lot of people at that age think they're very seasoned and they already know everything, hence the lines, "i can't believe/it's been so long/can't believe/i can't see/seventeen/can't be wrong/seventeen/fall on me." Some lines convey the revolutionary attitude teenagers sometimes have (or had), like "wake up demonstrations said silence is the wrong word," "i want to watch the world from the edge of my seat when it burns," "i want to walk the outside/they're burning down the houses," and "gonna make a big scene/here comes/ faith comes/banging on a tin drum." Besides those parts, I don't know.