Yes, it may seem irrelevant comparing your vote like a drop of water in an ocean because practically, it makes no difference.
But come to think about it the other way round. A drop of water in a bucket can go a long way to fill it at the end of the day. No matter how insignificant it may seem, you are not alone. With mine and yours put together, we will make that ocean of water. Click here to have a full view.