Is my harmonica the right size?

I dug out my old harmonica last night and i got it when i was about 11, im now 15 and it feels really small and Im finding it difficult to fit my mouth over just one of the holes when I used to be able to do it so easily, I know I have grown since then but Im also sure its probably a kids one, do they come in bigger sizes?? I measured it and its only about ten cms