Yes it is better to keep training even if your muscle is still sore.
My training was based on concentration, and it's impossible to cheat when you are concentrated
Genetics help to some degree, but the most important thing is the mind and the spirit. These two are even more powerful than physical characteristics that are passed on.
Trust me when you love something you don't need motivation.
Bodybuilding is not only a sport but first an ART.
If you don't like don't do it. But don't forget that: NO PAIN NO GAIN.