How does one find and make good/genuine friends?

Hello!

Before you read any further, I just want to warn you that I am 15, and have inevitably been affected by GenZ slang. My writing skills also probably suck. Apologize in advance!

Objectively, my life is pretty good. I have a healthy body, I'm average build, average intelligence, nothing really to complain about. I have a loving family, and we don't have any financial issues. I don't have anything to worry about, other than maybe failing my next math test. Pretty much anything a dude can ask for.

Despite all that, and I have a feeling this might be universal, I do feel a little empty at times. I think there are a number of reasons for this but as the title says, this post is going to focus mainly on friendship.

Highschool is the time where I feel like I should be making my friends for life, and it's not going too great. I'm not trying to say I don't have any friends. I do, and they're cool (debatable). However, I don't really have anything I would consider a "close friend". For example, if one day, I wanted to go to the mall or something, I don't have a friend/friend group who I could invite to go with me. In fact, I barely talk to anyone unless I'm in school. I think the reason for this stems from a couple of things. First, I'm pretty introverted and don't like socializing all that much. Second, I just don't really want to be friends with the people around me.

For context, I go to an all boys school. Everyone just seems extremely shallow, and for lack of a better word "NPCs". People are always spouting brainrot and unironically use words like "skibidi" in their dialogue. And if they're not doing that, they're talking about girls or making very *interesting* jokes. There's nothing wrong with that (excluding the jokes), but it's just not really my type of thing.

Am I just being too picky? Should I just suck it up and cope? Or should I try to make friends externally, outside of school, and if so, how would i do that?

I do realize I sound a bit whiny and y'all might cook me but please don't!!

Any advice is appreciated.

I tried to post to r/LifeAdvice but it got immediately removed so if anyone knows why that would be great.