self discipline is hard because we are ruled too often by our strong emotions.
We have strong urges that helped us get to where we are. I'm assuming you are taking about physical needs we all have like food and sex.
i blame Eve
It is not for me. What can't you control?
It really isn't that hard.
Some get addicted
It gets easier with practice.
It isn't hard, you are weak, get some willpower.