Lyric discussion by IceCreamSandwich 

Cover art for All I Ask lyrics by Vanessa Carlton

I think she's saying that she isn't that happy, but she still doesn't want people to worry about her.

Walking on water is considered a miracle in a few religions, because It's generally regarded as something impossible (no duh). I think she's comparing holding on to walking on water; in other words, she's saying she can't hold on.

This is one bitchin' song!

My Interpretation