I’m scared I’m gonna die as lonely as I feel right now

Lately, I've been feeling so alone. It's just really hard to keep up with people sometimes. My introversion seems to be a big factor as to why I'm feeling like this. And having extrovert friends is not making it any easier. I feel like I have to talk all the time so I wouldn't feel like I am such an asshole or a grumpy bitch. It's also hard for me when my friends have "other" friends" (e.g. internet friends). Suddenly I am out of the page. It's really hard. I don't mind them being associated with other people and all but it gets lonely sometimes. Like, they have this other dimension and I'm not part of it.