I feel alone and alone and alone and alone

My friends keep talking to me about going out when in school, but it’s always been kinda between them, like if a girl would say “we should go out sometime” she’d be saying it more to my friends rather than to me too, and if I agree I just get nodded at while they throw suggestions with clear interest, they went out a couple days ago and didn’t invite me, took a picture and posted it on their accounts, even sent me a streak on ***, I jotted it off in my brain as a simple mistake since the girl that sent the streak does have many friends so she probably clicked on send to all, but then I realize, if she’s so worried about me seeing she would have specifically clicked my account to stop the streak from getting sent to me, but in reality, she completely forgot about my existence so she never bothered to do anything because to her this isn’t avoidance of someone it’s simply Forgetting they exist and not having invited them. What hurts the most is that I’m constantly hyping them up on their stories and calling them pretty (because this isn’t the first time they went out without me) and I did that trying to show I’m not bothered, but I think that just kinda gave them silent permission to keep doing it thinking it doesn’t bother me. I don’t want to be that girl who complains about not being invited to outings, it feels embarrassing and like such a big party downer thing to do. They’re having fun and that’s what’s important. Right? But it never felt like that deep inside. It felt more like a problem in me I just am not aware of, like is it my looks? I love sports so maybe it’s that I’m too “boy-ish”, I have worn makeup and dresses when it’s important but I never outwardly do these things at school like the rest of the girls, is it that my face has Pimples and theirs bas makeup? Is that my hair is in a lazy ponytail and theirs is always put effort into? Is it that I don’t know people? Is it that I have a problem? Am I mean? Am I rude? Do I do things I’m not supposed to? I don’t know the problem with me. All I know is that this keeps happening. With my football club teammates and with my school friends, and it feels like I don’t belong anywhere but my room.