I've already grow up.I'm not a boy,not yet a man
我不是男孩子了,我已经长大了,但我还不算是成熟的男人
I am not a boy, I have been grown up, however, I am not a mature man yet.
I'm not a boy any more, I have grown up, but I am not mature enough.
I'm not a boy any more, I've been grown up, although I'm not mature enough.
"我不是男孩子了,我已经长大了,但我还不算是成熟的男人。”
I'm not a baby,now!I'm a man though with less mature in me.