I completely know what your going through, Leigha was the same. What it was that was bothering her is that it would splash up and hit her bum...so i brought a kids seat for the toilet...that worked, but she only used that for 4 days then went straight to just using the toilet.
Also. With poo...they are used to it sitting next to them in their nappies..i guess it weird at the start to feel it drop out..you know? Its new for both of you...but stick with it..it is hard work but its rewarding when you dont have to clean up those poopy nappies anymore lol

keep at it, im sure your doing a fantastic job.