Canon does not make any DSLR lenses that "auto zoom'. All they can do is auto focus. Some lenses do have barrels that rotate the barrel when they change focus, which can lend the impression that they are changing focal length, or zooming. I believe the two lenses you seem to have mentioned do exactly that.
Make sure the AF/MF switch on the lens barrels is set to AF, Auto Focus. The MF setting is for Manual Focus.
Thanks for the info but i guess i am struggling with the 18-55 because the barrel wont turn on itself even the switch is on to AF
Do not turn the focus ring when the AF/MF switch is in the AF position. You can jam the motors, which I suspect is your issue.
Look for the post by Canon Product Expert Julius in the above thread. Read through the entire thread.