i dont know where im going with this

no one ever needs anything.

they only want.

"i need to get atleast 75 on this test"

no. you want it. because you want a good mark because you want your mark to go up..ect."

you want it because you dont want the alternative. aka failing.

you dont need to go to school. you probably should, you probably should want to, but you dont need to.

lets get a more exagerated example

"you need to take this medicine for your illness or else you'll die."

you might think this is a flaw in my theory. but it isnt.

you want to take the medicine because you dont want the alternative; death.

but you dont need to take it.

you never need to do anything.