I feel useless and have nothing to talk about with my peers.

You can try to blend into their circle, or you can find your own circle. It is ok to have more hobbies.

You can watch popular TV series, for example, you can ask them what good TV series and movies they have recently, and then you can make an appointment to watch them together or watch them alone with your family, and then talk after watching them.

You can be, what you like, what you like.

Like me, some hobbies are relatively unpopular. Girls in their twenties like to play with stones, which is the kind of carving. Some people may not have this hobby, but others do. For example, they are infatuated with handsome guys and like watching Thai dramas and novels, which makes them sing with others.

There are many topics to talk about, sometimes casually, such as interesting stories when I was a child, jokes I heard, and some previous experiences.