Under sunshine, we'll shine together.....Under rain, I got you? What am I?

I am a green-eyed monster silent and sly I live in the heart but I never die I poison the joy of the successes you see And I’m born when you wish to be me

I beat within but can be given, I break though still I keep you living. I’m more than flesh, yet still I’m true, the core of life that beats in you.

I have cities, but no houses I have mountains, but no trees I have water, but no fish I have roads, but no cars What am I

I am a circle with a missing heart, but I am not broken. I have a skin of gold and sometimes a crown of sugar, yet I have no head. I have a ring but no finger to wear it. I have a body, yet I am hollowed out by my own birth. If you seek my beginning, you will find yourself back at the end. What am I?