my mom had my brother at 15 and she wasnt very big either and it was okay for her to have him vaginaly :)
I got pregnant at 15 & 16 and I was 98 pounds soak n wet & I pushed both of them babies out. I begged for a c section because I was scared but my baby was head down & they would not give meone & I am glad now. Age dosent make a difference. Usually you only get a c section if the baby is breech, you have complications during delivery or the baby is a huge baby.
age is not a reason to get a c-section. Go on this website and read up on delivery options. You should talk to your OBGYN or nurse midwife about your delivery.........http://www.pregnancy.org/labor-and-delivery
It doesn't matter in terms of a C-section. You won't need a C-section merely from being 15.