I travel with my boyfriend and stay in a hotel at night. I don't have an ID card, and I don't look like an adult. Can we stay?

It depends. If you go to a bigger city and stay in a hotel, it is not a question of staying in a hotel. After all, you are a student and don't have that much money, but you'd better find a formal hotel and open a small standard room. The most important thing is that the police will not check the hotel.

If you go to a small place, these small places are generally closed and not very open in this respect. Not only the police, but others will blackmail you.

So although I don't think there's anything wrong with you doing this, it's still important to be careful. However, if you decide to go, don't be afraid to show others that the students are not married. It's not necessary. You are an adult. This is your freedom and generosity. People won't see at a glance that you are unnatural and won't arrest you, will they?