Afraid of sharing my faith

I live in Germany and some of you may know, Germany is an extremely liberal, secular country. My parents are both "officially Christian" but none of them actually go to church or even believe it. I always had trouble opening up to people, even if it's my parents, but it's particularly difficult with the Catholic faith. My parents normally aren't that strict, but I'm very afraid telling them the truth. I'm the first Catholic in my family since probably 5 centuries. Luckily, my mom is a bit more open to it, but I still don't tell them, that I pray, or go to church. And I do stuff like hiding my rosary, but it doesn't feel right and I know that it goes against God's commandments but I don't know what to do.

There are also no Catholics in my age at the church, so I feel really alone in my faith. I don't know what to do, and decided to ask for advice here, so please let me know if you have any.

Thanks