Letting go and accepting him as a little boy

Ive been coming to the scary realisation my eldest is definatly no longer a baby . He is indeed a boy . Lately he seems to have become so very independent , makes his own breakfast (and his brothers) helps with housework, makes his own bed, washes, drys and dresses himself at the sink..alone! (although i still fill the sink). He's made his own choice to move out of pants and into boxer shorts (he was given a packet for christmas and told me next time i don't want new pants i want boxer shorts..so thats what we bought him), choses what to wear etc. Last week i tried to enrol him in an after schools art and craft club, there where no places left, the other courses had places i went to put him down for the dance/drama class as i thought he whould enjoy it and the excerise..he replied "actually mummy can i do the computor lessons" . Thats when i realised he may be my little boy, but hes ultimatly his own person, with his own choices to make. Hes growing up so fast, im currently wondering where almost half a decade has gone.