I feel lonely af and I hate it

Sincerely, I recently discovered how lonely I feel. And that I absolutely do not like group conversations anymore. I love talking to people one on one and getting to know them. Everytime I talked to them alone, they deeply connected to me and started to like me so much more. But, in group conversations, no one wants to talk to me and I have nothing of use to add in the current topic. Even if there is two people and me in the mix, they rather talk to each other than me. I know people are not forced to talk to me, and I completely understand, but I want to talk to someone, and if I don't, I feel lonely but if I try to enter the conversation, I need to pratically shout my thoughts, which comes out desperate af and people hate when others need to scream. Every single one of them rather talk more to their close friends than me. Now, that I stopped relying on groups to talk, I feel like an outcast. All my best friends keep talking about topics between each other and other people which I want more of in my life, only stay surrounded by their friends, and I can't have any time alone with them. So, now I feel so lonely. Because I know that they don't actually need me in their lives, like I need them. So, that if I was gone, they wouldn't even miss me. They would probably say they would, but for real, I know they won't. And I hate being lonely nowadays.