I'm a beginning guitar player, with a secondhand Yamaha FG-180J I got as a gift. The strings were already wound when I got it. Upon playing it, I had a lot of trouble playing barre chords. The strings feel tight and it's relatively high-action. It's a really old guitar by the way, with some of the old pegs having been replaced.
How can I change/adjust the guitar to make it easier to play barre chords? I can play barre chords using other guitars with relative ease but I'm stumped using mine. It's frustrating. I'm trying finger strengthening exercises but to still no avail. The middle and sometimes last strings are the the most difficult, I find. I can't put enough pressure on the fret and I end up muting the strings.