Thank you everyone. I got it working.
I tried to add my user to the cdrom group by using:
usermod -G cdrom (username)
I thought that it would append the cdrom group to my username but instead it put my user in only one group.
I fixed it by going to root from boot up with acid_kewpie`s suggestion and adding my user to all of the groups:
usermod -G users,wheel,audio,cdrom (username)
In my case the wheel group is important for getting root acess.
Thank you very much.