Why do we strive to be loved?

Why do we strive to be loved by other people? Why do we feel like if someone else does something, then it's okay for us to do it, to even out the playing field? Why do we strive to make things fair when we know that life isn't always going to be? Why do we worry about what other people think more than what God thinks of us? Why can't we do what's right no matter what everyone else is doing? Even if things don't turn out fairly, isn't the satisfaction of knowing you're doing what Jesus would do better than knowing that you were just as low as the other people? Why isn't God's love enough for us, and we feel like we need to feel loved by other people? Why aren't we satisfied with God's love when it's the greatest love of all? He sent His PERFECT son to die for people like us, who disregard His ultimate act of love! Why can't we realize that He's on our side and that when we stand up for what we believe in no one can stand against us because we have the Creator of the ENTIRE UNIVERSE with us?