Your example suggests that you haven't accurately sensed the meaning of futile, which means something like 'unproductive or ineffective to some particular end'. Therefore, your sentence doesn't make sense. It doesn't mean 'pointless' in the sense of 'without meaning' or 'without reason' and it doesn't mean anything like 'unnecessary'.
I presume that you're trying to practise using futile, so I'll offer what I hope is a better example: In TV's classic science-fiction series Star Trek, there is a race of powerful alien beings whose aim is to subjugate and assimilate other races. Their famous dictum is "Resistance is futile!" The message they wish to convey is that any resistance is simply a waste of energy, since it is bound to be wholly unsuccessful.