Take the opportunity to team up with a German native speaker who wants to learn your language.
The International Preparatory and Language Center offers matching and guiding language tandems. Application for the programme in winter term 2019 is open until the end of October. You need your JGU account to apply (you'll register for an account at the Info Days).
Application: https://www.issktandem.uni-mainz.de/
More info: https://www.issk.uni-mainz.de/sprachtandem/