Mixed feelings abt my friends

(Note! English is not my first language, and my grammar might suck. I'm bad at explaining things as well, but I'll try my best because I really need to get this off of my chest.)

My friend group consists of 3 people(all girls...dk if that needs to be said) we're all still school girls. I've been friends with them for around 3 or 4 years now. During our whole friendship, there had always been a duo in our group. At first, i didn't mind cuz I guess they're just really compatible with each other but as the year goes by, it just starts to get to me and I couldn't help but to feel left out. I don't get left out directly where they would completely ignore and hang out without me, it's more IDK HOW TO EXPLAIN IT.

Okay let's call girl number 1 Liz and girl number 2 Rin.

Whenever Rin got some story to tell us, I noticed that she would ONLY make eye contact with Liz. Idk if im just overthinking, but it feels like she's only having a conversation with Liz and I'm out of it...and whenever that happens, I just gave up on listening because of this feeling...

Other than that, whenever I want to go to the canteen to buy some food, I would always ask one of them if they wanna come with me or not (this happened a lot), whenever I ask Rin if she wants to accompany me to go to the canteen, she would be like "nooo I'm kinda lazy. I'll just stay here" and then when I ask Liz and Liz agrees, Rin will automatically change her mind and decided to follow along as well. I was like what. (Guys pls tell me if I'm making a big deal out of this cuz I know I'm kinda dumb and my brain is not fully developed)

NOT ONLY THAT, whenever me and Rin are alone together, it feels so awkward. We don't really have things in common and it feels like she doesn't wanna talk to me...

but whenever Liz is around, they're so talkative and happy... I just feel so left out...

I feel like the main problem is me and Rin not being compatible in the friend group. Liz is really nice and outgoing and kinda an extrovert, Rin is like that too, whereas I'm more to an introvert..

And I also have to be honest on what I feel about Liz and Rin. First of all, there are some things that I don't like about them (not that deep)

I'm so sorry but I don't like how they depend on each other whether or not they want to do things...it's like "I'll do it if you do it" like bro pls just do whatever u want...

I feel trapped that they're my only close friends (I couldn't think of a better word to describe it)

Whenever I invite them to play badminton (the sport that I like), Lin and Riz would always reject because they either don't have the mood or don't want to get sweaty. And at the end, I can't play badminton because I DONT HAVE ANYONE ELSE TO PLAY WITH...:(( it has been SO LONG since I even held a racket, and I THINK ABOUT IT EVERYDAY.

And I don't really like Rin's mindset/her decisions....long story short, whenever a boy gives her attention for like a week or two, she would immediately think of dating him. At first she denies it and be like "I just want to get to know him" BUT NOT EVEN A MONTH OF KNOWING EACH OTHER, THEY WOULD START DATING AND IT WOULD LAST A MAXIMUM OF 3 MONTHS AND SHE WOULD CONSIDER IT "long" LIKze bro what how miserable is ur dating life...

and then the cycle continues over and over again and I have to deal with her vents and complaints every time she and her partner break up... don't get me wrong, there's nothing wrong with this, but it gets to a point where it's annoying yk? This happened so many times, the cycle repeats and at this point I don't give a fuck anymore to comfort and give advice that she won't listen.

There are so many other things that happened but I just don't know how to put it into words...

In conclusion, there's a duo in a trio, MAYBE I'm the problem, I wanna get out of this friend group, my heart feels heavy every time I hang out with them, I'm always the last choice, can I just delete myself

Honestly rn Idk what to do, I'm so lost. Maybe im just freaking miserable and sad..

What should I do to stop centering my whole mood and life around them? I guess if they want to be that way, then let them be. I just don't want to waste my teenage years with these feelings. I want to enjoy my carefree life before becoming an adult