guitar help

I picked up my guitar again and I'm giving it another go.
Right now I'm trying to learn the Misfits version of the Monster Mash.
the tab i'm using says to put my index finger on the top string on the 5th fret and my ring finger on the second to top string on the 7th fret.
the only problem is it hurts like hell stretching my fingers that far.
is there a way to get my fingers to stretch farther?
or is that just something my hand is going to have to get used too?
Right now I'm trying to learn the Misfits version of the Monster Mash.
the tab i'm using says to put my index finger on the top string on the 5th fret and my ring finger on the second to top string on the 7th fret.
the only problem is it hurts like hell stretching my fingers that far.
is there a way to get my fingers to stretch farther?
or is that just something my hand is going to have to get used too?