I've been using a mala with chanting for the past 8 years. I've always used my thumb and index finger to move the beads.
Today I found out that you are supposed to use the thumb and middle finger to move the mala beads, and you are supposed to avoid touching
the mala with your index finger.
Is this error very bad? Does it mean that none of my mantras worked?

I'm feeling frustrated about this.