By Andrea Tse02/15/13 – 01:07 PM EST NEW YORK (TheStreet) — Major U.S. stock averages were trading lower midday Friday as investors digested stronger-than-expected consumer sentiment and New York manufacturing data and awaited the results of the weekend G-20 meeting. The Dow Jones Industrial Average was down 2.8 points to 13,970. The blue-chip index is up 4.8% from its 2013…