Key of G chords, Key of A#/Bb. Capo 3. G Em D C Don't be afraid, it's only love (x4) G-Em-D-C Love is simple (x3) G Em D C Don't be afraid, you're already dead (x4) G-Em-D-C Love is simple. I personally do the Same chord progression for the "da-da-da" part as well, but you figure another one out if you want. All I know is this matches the key of the recording of song. Ear training is how you do it.
Source: https://tabs.ultimate-guitar.com/tab/akronfamily/dont_be_afraid_youre_already_dead_chords_988532