i’m 23 and i feel ill after one drink…is this normal??

i’m 23, almost 24, and for the past year or so, i just can’t drink alcohol. i can have one pint and feel headachey and tired and just slightly ill. any more than 3 pints and i just feel extremely sick but not particularly drunk. is there something wrong with me?? it’s turning me into a bit of a boring person as i never really want to go out to the pub or anything anymore or get drunk with my friends bc i literally can’t. any advice??