I'm jealous when my friends get new friends. I'm jealous when someone I like is causally speaking with someone else. I'm jealous when I don't have someone's absolute condition?
What is wrong with me? Why do I have such security issues? What can be the root to all of this? It's driving me insane? Why am I so jealous?

Because you are insecure in your life. Do you have a job, do you go to school? Do you have parents and if you do, was your homelife pretty well stable and disciplined? Sit down and think about it.

OK it sounds like to me that you are very self centered. You want what other people have because you don't have it and you want it. I suggest you do charity work work with people who have less then you, get a hobby volunteer just stop thinking about yourself.
And maybe you could (if you want) get a religion (if you don't already) attend church and learn more about yourself.
Remember things are things and let other people enjoy what they have, you are wasting time being jelous you need to get out of your head and experience things for your own. And want something cause you want it not because someone else has it.
(remember this is just my opinion I am not an expertand don't assume me to be)

Jealosy is fear, or it is born of fear. What are you afraid of?

Jealousy can also be extremely helpful (!) It can be a driving force in your life it you let it.

What I´m getting at is turning it around and becoming curious.

When you get jealous when a friend gets a new friend, try thinking: OK, so what is missing in my life? I´ll work hard to become as popular as this person - if that is what you want. When you´ve worked through your issues, your jealousy should stop.

All the best to you,
Violet