Thanks Sudhaama
My experience was totally different. I do not like film songs much except if they are devotional songs.
I started listening to carnatic music songs first.Initially ,it was simple songs without any alapana.

Then,if i like a particular song very much,i'll then find out its raga name and then hear other songs in that same raga.i'll hear the songs i like repeatedly throughout the day from my PC.then,i started listening to songs which have alapanai and mostly can recognise ragas if the alapanais are nearly same. I'll follow the advice of seniors here--i.e hear more and more songs