I won't be able to do copyright if I use GarageBand loops on my song ?

You can use GarageBand loops tom create your own compositions and make commercial music with it. This is explained here: Using royalty-free loops in GarageBand with commercial work - Apple Support

The GarageBand software license agreement says:

"GarageBand Software. You may use the Apple and third party audio loop content (Audio Content), contained in or otherwise included with the Apple Software, on a royalty-free basis, to create your own original music compositions or audio projects. You may broadcast and/or distribute your own music compositions or audio projects that were created using the Audio Content, however, individual audio loops may not be commercially or otherwise distributed on a standalone basis, nor may they be repackaged in whole or in part as audio samples, sound effects or music beds."

So don't worry, you can make commercial music with GarageBand, you just can't distribute the loops as loops.