I need advice on how to tell my bf....?

my bf is really inmature. everyone thinks that. i do to and i dont want to tell him and make him stop being himself. i dont want to hurt him either but i want him to grow up. just even if its a little bit. i really need help on how to tell him nicely!!!!! and im NOT going to break up wih him for this. :)I need advice on how to tell my bf....?
hmmmmm... dats pretty hard, basically just ask him nicely to be a lil mature for u, not a great advice but hope it works

skin