How to deal with a lack of belonging

How can you deal with a lack of belonging? I believe everyone has gone through this phase in life or will go through it at some point. In my case, I used to be part of a group of friends, but after we finished school, people started talking badly about each other and the group fell apart. It’s been almost a year now that I’ve had no close friendships.I go to the park alone to run, I study, I work, I message a few people just to keep in touch, but I don’t go out with a specific group of people, I don’t talk to anyone every day, and I’m not dating or anything like that. I’m 17 years old, and I’ve been thinking about ways to deal with this.