Dreading how lonely this is

Genuinely I hate how people are in med school and how cliquey everything is. Genuinely feel so out of place here, and it is so hard making meaningful friendships. So many groupchats going around im not in, everyone feels fake, and just not vibing with people. Im in one groupchat and I dont vibe with anyone well. I thought had a good friend but the second I introduced them to people I thought were friends I was gonna have, they all became friends and have left me out since. They actively pursued trying to hang with them too and then all of a sudden there was a shift. I see them making plans in front of me, texting to each other right next to me etc. I talk to so many people everyday and can conversate with everyone in my cohort but feels like nothing lasts. All buddy buddy, till I get invited to nothing/ not included in anything. Genuinely idk if its my personality, cuz im younger than almost everyone in my class, or something else. I dont think it is a personality issue cuz i didnt have trouble making friends groups in college and a huge day one friend group. But it feels so isolating that I just havent found a good group and just am a floater. I wish i didnt waste time with that “friend” all orientation and met more people. Idk but ts is so lonely