Y do i CARE ?

Another question come up in my mind again....
hwever, i dont know hw to answer this question !
There is no reasons to me...but it seems like there is sth push me to do that !
Although i no there is no result...posibly negative for wat i have done ! Or mayb i jus to to comfort my heart which alw insist me to do this n that !
Nothing can be meaned something ?
OF course, it means Nothing to s.o but it is much worth to ME...
it's nothing but it realy does to ME !!!
At last, i cant answer y i do care ?

Ps: mayb it is such a stupid think- that's ME !