Yes, you are correct in that a single individual’s action will make no difference, just like your single vote makes no difference either. However if everyone does their part it can make a massive difference.
While your individual contribution makes no difference, you still should try to do your part. Yes, change takes work and a bit of sacrifice. Just like how it takes time out of your day to do research on candidates and go to the polls.
If you don’t do the work, it doesn’t make you smart or clever, it just makes you an asshole taking advantage of others.