So so so so so upset! !!!

So okay i have been a mom now for 11 years. I have never felt like more of a failure than I do right now. Just left parent teacher conferences and my oldest whom has always been such a good kid always does her homework i found out hasn't been doing nor turning in h.w whatsoever for her ela class! Mind you shes the oldest of 4 soon to be 5 . I always every day look at her h.w and she would always be doing math, science ect in front of me. I don't even understand how i haven't noticed her completely not doing any of this h.w for this class at all!!! Not just this. I feel my kids have no respect for our home. The girls room is such a mess. I have already took away phone/comp/t.v privilege. Still not working. So i think until i see a change Christmas just will have to wait. I feel awful for this but not sure what more to do. I have never spanked nor layed a finger on my kids because i was more than spanked my whole life as a kid. I refuse to do any physical harm or forms of punishment. Im just out of ideas and feeling really down=*(