I regretted it out of cowardice - "Damn, if this was a judo class I'd be good at it." - you know, 'running home to mama'. When I get angry in aikido I know I'm learning - that's my moment to really look at myself - what am i afraid of?
I really regret not being honest with myself sooner about why I couldn't do the techniques - that my injuries were emotional more than physical - then I could have healed sooner, been a better person..... and be chucking the sandans on their heads now!! yeah!!