I share an itunes account with my bro?

Okay, so me and my brother share an itunes account, & we both have iphones. We share a laptop but separate accounts. We both have itunes on out phones, & he has itunes on his account on the laptop. I was wondering if i couldget itunes on my account too. I'm just worried because the account is set up under his phone & email, but if i got it on my computer, i'm afraid he will get all my pictures & data & stuff, and i don't want him to get mad at me for messing it up, please please help me!

To share your music with multiple user accounts on one computer
On Mac OS X
Quit iTunes.
Locate your iTunes Media Folder. (This folder may instead be named "iTunes Music" if your iTunes Library was created before iTunes 9).By default, the iTunes Media folder is stored in one of the following locations:
~/Music/iTunes
~/Documents/iTunes/
Note: "~" represents your Home folder.

These locations can't be accessed by other accounts on your computer. In order for other users to be able to access your music, you must move the iTunes Media folder from them to a publicly accessible location.

Drag the iTunes Media folder to a publicly accessible location. The Public folder in your Home folder (~/Public) is a good location, or to another location outside your Home folder that other users have access to, such as /Users/Shared.
Important: Do not move the iTunes folder, the iTunes Library file or the iTunes Library.xml file.

Open iTunes.
From the iTunes menu, choose Preferences.
Click Advanced.
Click the Change button.
In the window that opens, navigate to the location of your iTunes Media folder.
Click Choose.
Repeat these steps for each user account that you want to share music with other users.

Note: If multiple users on your computer are storing music in one publicly accessible folder, duplicate song files appear when a user imports music from a CD that has already been imported by another user.

To listen to another account's music files
Open iTunes.
From the iTunes menu, choose Preferences.
Click Advanced.
Deselect the option to "Copy files to iTunes Media folder when adding to library file."
Click OK.
From the File menu, choose Add to Library.
Note: Windows users can also choose Add Folder to Library to add a folder of songs.

In the window that opens, navigate to the location where the other user's music is saved (the iTunes Media folder in this example).
Click Open.
Repeat these steps for each account that is listening to shared music.

When another user on the computer imports new music from CD, repeat steps 6 through 8 to add the music to your library.

A note about copyright
This software may be used to reproduce materials. It is licensed to you only for reproduction of non-copyrighted materials, materials in which you own the copyright, or materials you are authorized or legally permitted to reproduce. If you are uncertain about your right to copy any material, you should contact your legal advisor.

On Windows
Quit iTunes.
Locate your iTunes Media Folder. (This folder may instead be named "iTunes Music" if your iTunes Library was created before iTunes 9).It is stored by default:
Windows XP and Windows 2000: \Documents and Settings\username\My Documents\My Music\iTunes
Windows Vista and Windows 7: \Users\username\Music\iTunes
Note: By default, the Windows version of iTunes does not copy all of the music you add to your iTunes library to your iTunes Media folder. You can get iTunes to copy all of the Music in your library to your iTunes Media Folder (if you have enough hard drive space) by choosing Consolidate Library from the Advanced menu.

Drag the iTunes Media folder to a publicly accessible location. The publicly accessible music folder is:
Windows XP and Windows 2000: \Documents and Settings\All Users\Documents\My Music
Windows Vista and Windows 7: \Users\Public\Public Music
Important: Do not move the iTunes folder, the iTunes Library file or the iTunes Library.xml file.

Open iTunes.
From the Edit menu, choose Preferences.
Click Advanced.
Click the Change button.
Navigate in the Change Music Folder Location dialog to the location of your iTunes Media folder.
Click OK.
Repeat these steps for each account that is sharing music with other users.

Note: If multiple users on your computer are storing music in one publicly accessible folder, duplicate song files appear when a user imports music from a CD that has already been imported by another user.