Riddles on "what surrounds us" from Greece

What is that which sets your heart on fire , but at the same time it can make it too cold to break?

You are born with that. Usually you don't like it because of what other people think of it. What is it?

Everyone speaks highly of it, yet at times they don´t want to hear it. What is It?

People claim they want it but they don't always fight for it. What is it?

They will laugh when you fall
and will support you through it all.
They are not here by choice.
But they'll do anything to share your joys.
Who are they?

I can enslave you. You can't see me nor touch me. But once you defeat me, you can overcome all the difficulties in your life.

When you see much of me on others' faces, you cheer up in seconds no matter how grumpy you are.

Everyone is born with it and they spend it recklessly. But in the end, they want more of it. What is it?

I am not a necessity for you but you can't live without having me. What am I?

You will always find me in your heart. You can't describe me with words but through actions, cause in the end that's all that matters.