Can any devout Christians answer some of my questions?

Why does God have needs? And if He doesn't then why would He create us if He didn't need anything from us? I mean if He loves us then He is vunerable because anything that feels compion also feels pain. Why would God want to feel pain if He controls the universe? But if God chooses to feel pain so that He can also feel love, wouldn't that make Him not all-powerful?