It's a pity I never got to know you very much here. Sad to see you go, now. You will always be welcomed, should you return.
Hmm... if your mother doesn't trust your judgement concerning what web pages you visit, maybe she trust Folwren's? If you and your sister both state that this is one of the most harmless places on the web, maybe she will reconsider? Concerning time, as others have said, real life duties of course have to take precedence, but they are, after all, never a reason to abandon a nice pastime
entirely.
Anyway, all the best wishes to you for your further life. Be happy!