No one is useless in this life, we are all priceless, there would always be an area in which we will surely be needed, though, it might seems like people don't value us more but we all have where our attention is surely needed. No human being is a waste resources, we all contribute to life in one way or the other. It is just that our influence is more than the others just like grace is more than grace. Sorry I used that clause.
The desire to always add value to people life can't be over emphasize, the more value you add, the more people that is going to reckon with you more than ever. We you add value to people, your voice will surely be heard in a more meaningful and positive way.
When you add value to people's life, you are only doing yourself a favor. Because, you are building your sphere of influence.