It is really easy to steal in Skyrim, but i don't see an "alignment" good/neutral/evil in the skill menu or global stats - what are the negative consequences of stealing if you are not caught. I am playing otherwise as good char so i d

Nothing really. If you are caught, the person you stole from will send hired thugs after you.

You can get arrested then you either pay the bounty or go to jail and loose some of your skill progression, or you can fight the guards. Also people who you stole from might send hired thugs to give you a lesson.