Please help!

Hi. This question actually has several parts. I'm a teenage actress and singer who has performed extensively in New York and New Jersey. I have always looked somewhat young for my age. However, now that I am getting to the 'awkward stage' (16) where I look like neither an adult nor a child, I'm finding it increasingly difficult to find work. Most directors of plays and films, even when the main characters are teens (which is somewhat rare), want adults to play the roles because they don't have to pay for tutors or guardians on the set or on tour. Also, most roles in commericals, sitcoms, and even plays are for either young children or adults. I get all A's in school and pursue my music career locally, and I am definitely going to go to college after I graduate. My question is, in the meantime, should I continue to go on auditions in New York, or should I focus on my vocal and dance training and keeping my grades up in honors and AP courses? My second question is unrelated. I am only 5 feet tall; will this hinder me in the business in any way? Thank you very much!