I need serious adivice?

Im dating this girl and shes younger than me...well the problem is that im going 2 turn 17 on the 18th and she turned 12 last week...heres the deal when i first met her i swear 2 god i thought she was as old as me i mean she doesnt look think or even act like a 12 year old so yeah so my friends all have accepted it and also her friends did 2 especially this girl sam cuz shes the one who convinced me 2 date her cuz i didnt really want 2 b4 hand but yeah when she said that she doesnt look like a lil girl than i cant be called a child molester so yeah and that she really really likes me and all that so i said hey y not and everything has been going great so far and its been our first month dating ...and all we have done is cuddle and kiss so yeah i need some advice is this the right thing im doing ? or is it ok ?