Here's where my training as a bassist come in handy. When you listen to a song .... try to find (and follow) the BASS part. It is very often the root of the chord.
eg: a "G" note in the bass will probably be a G chord. You can tell major or minor after you get the right root !
Play along till your bass note matches the song, then try a full chord .... and see if it's major or minor. The fancy stuff comes later !