Though you are ok to feel that way, please know in just a little while everything from highschool is optional, and doesn't matter at all.

If it makes you feel any better, I didn't focus on my grades, graduated with middle-tier grades and still don't have any friends.

don't stress about it - I used to talk to many people, yet didn't keep any friends from high school and only one from undergrad, with who I make contact like twice a year.

It feels weird to keep in touch when you don't have that thing in common anymore and live far away.

Hi there! Consider your streak broken, I am now your first friend!

I was like that but weirdly I was 'adopted' into a group where everyone was a good student and it was uncool not to be. It was even the popular people in the class, full of very well-rounded people (they were social, also into sports or music, friends outside of school, etc).

I still stood up as a "nerd" for reasons that felt inexplicable at the time but later made sense as it turned out I'm autistic. I wasn't as well-rounded as them. I'd hang out with them but I couldn't wait to do things by myself like being at the library, learning languages and computer stuff and playing games.

I don't think any of these people talk to each other anymore because all of us grew in separate directions. I have made good friends since. I like the hobbies I got by allowing myself to do what I wanted. I like the opportunities I got from my grades.

I don't think high school is where you consolidate your friends for the rest of your life. Some people do it, but it's not a requirement.

To be fair, it's hard to keep up with high school friends after high school. People change, they go to college, get jobs, get married, have kids, move away, go to prison, and die. So don't worry if you're not friends with people you went to high school with, that's not uncommon.

I dropped out because of my social issues.

Associate with friends that also have good grades. You tend to take on the habits of your friends.