Hi I´m looking for a host family in great Britain

Hi my name is Joanna and I´m 15. I really want to improve my English. So I would like to visit Great Britain in my summer holidays or other holidays. I would preffer a family with a child but that´s not my problem. I can´t go into another country fo a whole year so I want to find some one for the holidays.I would like to know more about other cultures and of course the language.If you know a family I could visit text me please! That would be gret my E-Mail joanna_scheibel@web.de