Finding a job now a days is very hard, I can only imagine at the age of 16. A friend of mine and I looked for a job for about 3 months, applying at the same locations totaling 32 before we were both finally hired. He was hired almost a month before me, at no other than a... fast food restaurant. I ended up starting at a large amusement park, moving 40 miles away from my hometown.
He is a highschool dropout, with more job experience. I am a High School graduate, 3.4 GPA & currently learning spanish. You just never know exactly what employers are looking for.
My advice: Go in with a smile, you never know who will remember you. Be proud of yourself, any accomplishment you have obtained show them off.. no matter how small they may seem to you, put them down! It takes time and determination to find a job, and once you find one you'll want to hang onto it.
Hope this help, good luck!