jasmine620, if you have a lot going on in your life, it's really hard to stay motivated! That's where priorities come in. First priority should be taking care of yourself properly--and eating right (not necessarily for weight loss, but just eating right) should be right up there with washing your hair and brushing your teeth.
That way, even if you don't feel motivated, you'll still do what has become habit. You wouldn't not brush your teeth because you didn't feel motivated. I hope!
So planning what you're going to eat and making sure you have what you need--even if it's just the sandwich you'll get at the cafeteria--helps you make things more automatic and you don't have to second-guess so much.
If you are really feeling like you don't even want to shower, comb your hair, or brush your teeth... then you could have depression, and you should see a doctor about it, or perhaps talk to a counselor or trusted friend.
Don't give up! This is just life! You'll figure it out.
Jay