You should never doubt it, not for anything. Even when you feel the world is against you. Your Stuff Matters, and if you believe your doing is for nothing, beware; Everything happens for a reason and everything is possible for the one’s who really wants it. You are great stuff, and you’re made of great stuff.
You find stuff here, all kinds of stuff. You are probably here to find what you are looking for, so keep looking for it. It’s here.
You don’t know before you checked it out. There will always be more. Keep looking for your stuff.