Praying for something or everything?

I don't get how we're supposed to be able to prey for something with specificity. I just want to pray for everything. Then my head says "Zero-Sum" dude, so you have to pray for something! But where does it say that in the Bible?  Are my prayers any less intense if I pray for the well-being of everything while also dreading the thought because somewhere deep down my instincts say that the well being of everything just isn't possible? Why not?