I really want to work like creating websites as facebook, google, etc but what kind of profession I have to be?

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If you want to find a paid job creating websites you will need either a University degree or TAFE course in software development. Most Information Technology courses will have software development/programming/website design electives that you can take to learn these skills.

If you just wish to learn how create these websites for yourself then there are many many tutorials online however to be employed you will require a formal qualification

Within the industry there are two different kinds of developers. There is website design where the main focus is on the visual looks and appeal of the website including things like the graphic headers and the layout of the site and creating templates. The other is Website Applications where the focus tends to be more on the functionality of the the website i.e. writing to and reading from a database, creating online stores, pretty much anything involving more than a simple button. Some developers cover both areas but in larger companies (like the ones I work for) the two different tasks are split. For example I am an applications developer so the concept and design is created by our graphics department then it is passed to a website designer to turn the concept into reality then it is passed on to me if it requires any 'programming' for example online booking systems, e-commerce (shopping carts online payments etc), memberships etc.

Facebook, Twitter, Ebay etc are all website applications running in conjunction with a database. To learn ho to write one of these websites you would need to learn about databases and sql along with C++.NET or VB.NET. There are thousands of tutorials online. Visual Studio is the most popular application to create these websites look up some tutorials on it to get started.