Is losing friends from school and college a sign of maturity or reality?

After 30 you are hardly left with 1-2 friends from school and college. Rest are just social circle and acquaintances. And its okay. As you grow your priorities change and it should change. Otherwise you aren’t maturing enough.

My simple thought for life, less people less shit to deal with.

Reality of life.

Some genuine relations will still be there even if you guys aren't meeting regularly or in touch regularly.

However you can consider other relations as gone.

With time only you will know which ones are going to fall in which category.

People become friends in school and college because of proximity and ease. Once you pass out, very few remain in your life. But that's okay, you'll also make new friends. Nothing to worry about.

You can also try and stay in touch with them by making efforts.

And here I am losed mostly all the friends after school cz took science and different college then now graduated last month and the calls and notification everything has went silent and realized most of them were along because they needed my help and now it feels like what have I done wrong.

Different POV: Instead of losing out, I have gained friends. I wouldn't say very close friends but yeah atleast something is better than nothing.
There will be certain people who wouldn't be friends with you, but a lot of people are in the same boat as you are, wishing they had more friends.
Here's what I do. I rarely chat or talk with them on phone. If they are in the same city as I am, I ping them every weekend asking to hang out. When I visit my hometown, I make sure to ping everyone there to meet me.
You will need to put efforts, its not gonna be easy. Sometimes I meet people after 6months, 1yr or even more. We start talking from where we left last. Try to treat them if you are meeting them after a long time.
The more you hang out, the more the friendship will grow.
Please make sure to stay away from people who you aren't comfortable with or don't like.

It is the bitter truth of Life.

Structure of societal system.

You are being put into mass institutions as a young child with tons of friends to learn and play with each other.

Then you grow and the institution of marriage + kids and the individualistic structure of the modern markets put you into isolated units.

welcome to real world buddy,
my pov is it's all an arrangement which we make because it was accessible and convenient that time,we were the means to each other's end. we helped each other get somewhere. it was an useful arrangement.

Youve become rigid and dumb and your old brain cannot maintain friendships anymore

Yeah, I have come in terms that friends are temporary. I have lost all my friends to long distance, losing touch and petty misunderstandings. Tbh, I have reached a point where the only thing that matters is family (parents, spouse) I feel siblings get branched out too.