Lyric discussion by Omnibot 

Cover art for Don’t Know Yet lyrics by Silversun Pickups

It sounds to me like the song is about a rift in a relationship that is on the verge of being destroyed. The writer is wondering if they should "chip away" and make the relationship work, or "keep defenses up" even though that may lead to a fallout. The writer seems to be having a hardship and struggling with life at the same time and risks losing the other person (possibly significant other).

What tells me that there is a hardship? -Needs a fresh start now(wants to start over with or with the other person) -Face down in a fountain (they are drowning) -Should I hit the deck, fall through the floor (can't sink any lower)

Where is the uncertainty if the relationship will be repaired? -Hurry back, I think they're closing the gate (work it out before its gone for good) -Don't know what you're gunning for (don't know where they should go from this point in the relationship) -I know what it's like to lay awake all through the night. (the rift is causing sleepless nights)