I was in your shoes. Had this friend whom I thought was my friend. She didn't even contact me to spend time with me, so we grew distant. We were kids and kind of grew up together through family.
I would always be over my grandmother's house whenever my aunt would go over and bring her food of what she cooked. Both of my aunt's mother (grandmother, for me) and auntie (great-auntie, for me) lived in the same apartment (no stairs, apartments for disabled elders that looked like houses at first glance). My so-called friend's grandmother lived right next to mine. I've realized that she only played with me because she was bored and couldn't go over to her friends house. Around this time, was when Tik Tok just came out (it was known as Musical.ly) and we both followed each other on there. Then, it still had Direct Messages in the app, and I had been trying to contact her through there whenever I wasn't over at my grandma's. She never replied.
In middle school, she became unreachable. I couldn't even talk to her during break time outside, because she was always surrounded by her friends. After that, she completely ignored me.

The Story of my life .
I hope it don't hapoen u what happened me but if it continues u get used to it and it won't take an effect as much as it used to .
It can be lonely at the start but go through it like looking for water in a desert and eventually you won't be lonely no more .
I can't say what to do but i was a people person but im not as much no more .
I just lost interest in running and chasing people all the time looking for approval to be liked cause do u know if u get it ?
You won't like that either cause the happiness is all inside u but a very very very very very very very very painful journey to get there and do u know when u get there u won't know cause u have it already .
Thats the must confusing thing about life .🤗.
I hope that helps

Wait, your teacher?
You're in your twenties.

These people are not your friends.

Hey, don't write yourself off yet
It's only in your head you feel left out or looked down on
Just try your best, try everything you can
And don't you worry what they tell themselves when you're away

I had a friends, who only saw me, when it was convenient, for them.

Don't let such feelings overwhelm you !

Find new friends or just distance yourself from them. There's no point in allowing yourself to be treated that way when they're totally disrespectful towards you, that's not friendship.

ditch them and become alone like meeeeeeee