Hey Leah4EverAndEver,
Slipin Lizard gives some great advice as far as learning a new song goes. It applies in most cases, but here is a little different. I've played the song you want to learn behind female singers in Nashville, and it's not as easy as just learning the chord progression. This song was recorded in the key of E, but it has a lot of sus chords in it, to put it another way, it doesn't just use the open chords you know.

The acoustic intro is played on the top 3 strings barring the 2nd fret with the index finger, and hammering on in the 4th fret on the 5th string. After that it repeats 3 more times before the fiddle starts. Learning this part is a must for this song, and this is actually the easy part. When you get to the chorus it gets even more complicated, as you start adding notes to the E chord.

Kudos to you for trying, but you may want to start with something easier. If you still want to do this one, try what I mentioned before. You'll have to use a barred E chord in the 2nd fret, and slowly play the open E string, and then the 5th with the bar. Then keeping the bar in position use your ring finger to hammer on in the 4th fret on the 5th string. Now you can hear the basic notes for the acoustic intro on the recording.

Practice this slowly until you get used to it, and then you can work on the rhythm. I hope this helps you, and let me know how it goes.