It's about unrequited love. The singer tries to get his affection's attention, changing himself, pledging his undying love, but he doesn't seem to be successful at it. All he can do is keep trying, but it's futile, because his love doesn't seem to notice him no matter how hard he tries.
He asks if they 'shiver', which could possibly mean that he's wondering if his love can shake off from their normal standing in (society, social cliques, etc) long enough to finally notice him. This may suggest that he loves someone above his station or class.