[Sirenos]

> Is it normal that I don't have close friends and that I'm solitary? Am I missing out on anything?

Not really. Not everybody needs to or wants to have a huge circle of friends. And let's face it, it's impossible to have a huge circle of close friends. You wouldn't be able to maintain the friendships AND your studies, hobbies, etc.

> What hobbies do you advise me to adopt that I can do in a group, with camaraderie?

Strength training, hiking, biking, running, dancing, watching anime/drama/movies in a group -- so many to choose from. Just try out whatever interests you. You'll end up meeting lifelong friends just doing that.

And trust me, high school is a not a big deal. It's a very small chunk of your life compared to what's ahead. And what's ahead is much much better.