I don't know if its something I need to "get used to" or if its a problem I won't be able to overcome. Ive played guitar for 13 years and haven't noticed this until now that I'm taking classical lessons. My teacher showed me an exercise where I have to use bar chords and I have trouble getting all the strings to sound.

Basically my problem is that my finger that I use to bar doesn't push all the way down on the 3rd string (G). All the other ones are fine, but the G string lies right on the part of my finger that is in between the joins, so it doesn't press down as far (if that makes any sense). All I get is a muted sound. When playing arpeggios its noticeable because one string is just dead. If I push down harder it works better, but I have to really push down hard to the point that it will be painful to play long like that using that much pressure.

Anyone else have this problem or have any recommendations?