At want point is to much when it comes to yelling at your children.?

I'm tired of the sticker chart, the oh I'll kiss your little butts and be your maid and servant. I'm done! I just screamed at my son to get dressed, go to the bathroom, and brush his teeth, drink his juice, make his breakfast, eat it. Seriously, at what age do I have to stop wiping his butt so he doesn't smell like poop for the whole day. Then I have my 2 year old not eating. I just put her in her high chair and she can sit there the whole day if it takes to eat her food. I'm so done with this I'm mommy will take care of everything. How about everyone do for your selfs.