Good news for exchange students: Even though school and family life is time-consuming you will have leisure time to spend at your will. How about trying out a new sport, or instrument, or deepening your knowledge of chess, environmental issues or other topics? Almost everything is possible here in Germany.
German teenagers also like to just hang out, listen to music, go to the cinema, shopping or get together to eat some ice cream. Feel free to join in those activities and experience life as a German student, it will give you many valuable memories to take home.