@CC- True, premarital sex is more rampant in small towns and villages. I think Navya has pined her hopes on Mumbai too much for getting all her dreams. She is one-directional about it, she wants music so she has to be part of fab5 , not even thinking about whether they will accept her, her music suit their genre or not. Similarly with harshad- she loves the idea of him, because that is all she has dreamed about , hence the oblivious reaction to everything. Being rational is not something that comes to her especially if it's needed for her dreams.
@Nandini is more aware of life, i don't even know if she is properly a small town girl. She is sorted and has been rational all the while since the accident. Very rarely she gives in to letting her hair down and having fun. There was a scene with her watching sponge bob cartoon with Rishab when Manik calls her for spot duties, that was the only time I realized just how young she is.