Why do i get anxious from alcohol?

A little context: im almost 14 days sober off weed because i had an episode where i drank 1 beer and smoked and ended up puking for almost 2 days in a row with very bad anxiety (most likely CHS), whenever i have even 1 hard seltzer i get anxious and the only way to relieve it is to sober up in a hot bath

That being said is this a common thing?, i feel like somethings wrong chemically in my brain, i dont mind being sober but im college so obviously theres a reason to drink and it just sucks watching my friends drink and i cant due to my anxiety