Where all these variables stored?
 

I type in "set" and "env" command and find those variables but they are not setted in ~/.bash_profile so I suppose those things was configed in somewhere in /etc/.
Am I right?
I am new to bash.

There are more places bash looks when you start a bash shell.

- Execution sequence for .bash_profile, .bashrc, .bash_login, .profile and .bash_logout

Also have a look at the INVOCATION section in the bash manual page (man bash). Here's a summary: Bash Startup Files

re:drunna
 

My .bash_profile simply contains this line, what does the "-f" and "." after then means?

It means if there is a file called .bashrc in user's home folder, then source it.

source it - means run commands in that script, but instead creating a new subshell, execute them in present shell. so whatever you have set in script are now available to current shell (something like logout-login or refresh).

-f = if file exists
. = sourcing (you can also use 'source' instead of '.' both are same)

The test man page does tell you what these options do. They are also explained in the bash manual page (CONDITIONAL EXPRESSIONS section).