U2 fans are incredibly cerebral and, unfortunately, I think it's a curse just as much as it's a gift.
I don't care if a lyric is "cliche", as long as it makes me feel something. The song seems to be about someone at the end of their rope, and the chorus of "I don't know if I'm that strong" implies a bleak, unsure-at-best point of view from the protagonist. I've been in a bad way before, and I've felt like I was beyond help and so I relate with the lyric. I feel it. That's good enough for me.
"You feel like no one before" from Original of the Species is also a "cliche" lyric, but when I'm thinking of someone I love, someone who I just think is so incredible, well, that just about sums it up better than any inventive, clever lyric could have.