How to play bar chords on acoustic guitar?

For the last couple of days I've been trying to learn 21 Guns by Green Day and a large portion of the song is played with bar chords. I've been practicing these chords for awhile now but everytime I try I'm always muting at least one string. I can do this song quite easily on my friend's electric but I'm having problems on my acoustic. My finger is starting to hurt quite a bit as well from practicing. Anybody have suggestions on how to improve my bar chords?

Don't press down too hard, only the strings you intend to strum. Let the flesh of you fingers mute the strings you don't want.

There isn't anything more you can do but practice. You are turning your finger, right? Try it on an electric for a bit.Locke562

You should be aiming to position your finger as straight as you can as opposed to leaning as hard as you can. You still have to apply a fair amount of pressure with your finger to the fretboard, but a flat, straight finger is the key. Practise simply barring a whole fret and once you can do this without muting any of the strings, add the rest of chord shape.

first look at your palm close up. See the finger prints on your fingers. Quickly hit your knuckles hard with your other hand

first look at your palm close up. See the finger prints on your fingers. Quickly hit your knuckles hard with your other hand

links136

Capo?

You do it exactly the same way you do it on any other guitar.

Just keep practicing. Bar chords are frustrating for beginners, but keep at it and you'll get it eventually.