Very normal to have those feeling during pg. I have nursed through 2 pgs and by that point, it was all I could do not to throw the nursing child off my lap and waddle away, it was like nails on a chalkboard. Yes it does go away, when varies, for me it was never until the baby was born.
Nope, certainly not a terrible mother. Lactation support is what I do for a living so you can say that I am an avid breastfeeder, and I HATE breastfeeding while pg. I always did it because my children were not ready to wean when I decided I needed another baby. I always tell my moms that it is nothing like the breastfeeding they experienced before pg. It will get better though.
Yes, normal. I have weaned once and hated that so I stuck through it with the last two but I did find myself distracting them a lot so they wouldn't ask. It does go mostly away after birth, maybe a month after or so.