Should a Left handed guitar play right handed?
I write with my left hand but years ago, when I first picked up the guitar, I played right handed and never thought that I should be playing left handed. I've been studying jazz guitar since last September, about nine months. When I started, I could already play some chords. I've been practising seriously since then, but i struggle to break 100 beats per minute. My teacher says it's because I'm a lefty and I started late, (I'm 39).
Is this true? Will this influence my guitar playing?
How can I improve my speed?
I think that playing right handed may be causing some problems for you, but I TOTALLY disagree with your teacher about the "starting too late.."
My advice is to first try some concentrated exercises aimed at improving your speed. You can find excellent ones here:Practicing Guitar Scales for Rhythm and Speed Alternate Picking Scale Exercises
If you make an honest and diligent attempt at the above exercises and do not see improvement, then I would advise you to try switching to playing left handed. This is the more expensive alternative, as you would need a suitable guitar, but for some left handed people, playing right handed just does not work.
I would also advise you to consider finding a teacher who does not attribute your difficulties to your age or the age at which you began to study. That is poisonous thinking.
Please let us know how you progress!