Friends

Is it essential to try to fit in a group of friends, which they know each other for how long (like since secondary school) and barely know me that I never had growing up?

It is okay. If they have known each other for a while you can still join their friend group.

Is it essential to try to fit in a group of friends, which they know each other for how long (like since secondary school) and barely know me that I never had growing up?

Not essential no. If it's taking a lot of effort to try and fit in, that's most likely effort better placed somewhere else.
Friends come and go, so if it doesn't work, I wouldn't take it too personally.

Is it essential to try to fit in a group of friends, which they know each other for how long (like since secondary school) and barely know me that I never had growing up?

Yeah, but I do fear that they’ll find me boring that I don’t know what I like

Trying to move on from being bullied in school and being laughed at behind my back, is what I’m afraid of everytime I tried to join

I know what it is like but when you show people you that you care.They will not stop coming back after you and maybe you can try attending after school classes such as sports or etc to talk to people.

I’m in my mid 20s to be honest, although you have a great point of joining classes.

Maybe you can go to gym and make friends with people there and maybe change jobs or take a part time job where you can have a change in environment.

I appreciate your opinion, however, for me, I wanted to make friends until I grow up and say I’ve experienced being with many friends, like hanging out, doing activities and etc. So I could take it personally if I grew old knowing I never had that.

Is it essential to try to fit in a group of friends, which they know each other for how long (like since secondary school) and barely know me that I never had growing up?