Who am I?

I am a tree that stays in one place, but I am also the sun that which shines brightly through the clouds and keep you warm. I am also a rainbow that will fade in and out but be bold and colorful when I am there. I am also that rock that you kick on the road when you're upset, trying to make you feel better. I am that one flower in your garden that is still staying strong. I am the rainy day you actually wanted because you're upset. Who am I? I am always there, trying to make you feel better. I am Me.