what should i do?

so i have this friend group of four, including me, and we’ve been close since middle school. When we first got into high school, I was the only one placed in a different class while the other three stayed together... It kinda sucked back then and we're rarely met, but now we’re finally in the same class again in our second year.

the thing is, after we started being in the same class again. I began to notice how much closer they had gotten with each other, they even have a group chat with just the three of them, without me.. At first I didn’t really think much of it. I assumed it was natural since they spent a whole year together as just the three of them while I was in a different class

but over time I started feeling more and more left out. It feels like they often make plans with just the three of them, and they don’t really consider inviting me unless i insert myself into the conversation. They also hang out together a lot too. I mean, my parents are pretty strict, so when they invite me I often can’t go anyway, so I try to understand that part. But it still kind of sucks sometimes... oh also sometimes I even see them post stories with captions like “my trio” or “our trio,” and yeah… you can probably imagine how that makes me feel.

I’m going to be honest, I’m not trying to pretend to be a saint here. I do feel jealous and insecure about it, and sometimes it makes me feel like I’m being left behind. I don’t really know what I should do or if I’m just overthinking all of this