I completely forgot to do my homework
What made you forget to do your homework?
It was so hard to start doing it so I decided to not do it.
I understand that homework can be really difficult sometimes, but it's not an excuse to not do it at all. If you make this a habit it might be detrimental to your grades.
I had so many other things to do so it doesn't matter.
If it was hard, you should have gotten help. You shouldn't just not do the homework.