How much board is fair at home?

So I live with my dad at home and he own it so we have no rent or mortgage. I've just got a full time job and had been paying $25 a week, plus half of our internet and phone bill, my own phone credit and also all of my own expenses so that includes my $20+ a week on adult bus fares, female sanitary items, food out, shopping and all the other luxury stuff. Now that I've just gotten a full time job I'm wondering what is fair? I don't know the amount I'll be earning yet. I'm 18 and turned 18 a month ago. Is $50 fair on top of everything else mentioned? It's causing a lot of tension going back and forth. Thanks! (:

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