I'd give this job/horrible situation a year and then find another job. If you stay a year you can honestly say you gave it a good try, learned a lot, but are now ready for another challenge.

Your boss is using your youth and inexperience against you to abuse you. You don't have to put up with that; you can learn and grow under someone pleasant and professional more easily than with this jerk.

Look around--perhaps through your university--to find a mentor. A friend of mine told me there are young professional organizations she plans to join; maybe you can find something like this too. That way you can grow as a professional outside of whatever your present employment is. Courage!