pakistani here too
sorry to hear about your situation
your parents can't technically do anything to you since you're now an adult. they can't control you, force you to go to pakistan (and probably marry your cousin bushra) or undergo conversion therapy which is close to being banned in the country anyway.
it might be wise to prepare yourself in the event you get kicked out (but i pray that doesn't happen) - so read up on local services for young, homeless people.
is your uni local or far? if it's far, then that's a good opportunity to get away and become independent imo.
the above comment is also true, whether or not you're practicing!
the response of your parents is not surprising. pakistani parents are very traditional and conservative, and in pretty much cases, put a massive emphasis on marriage & kids, which isn't fair on people who simply don't want to get married / are asexual, or can't have kids, or who aren't straight etc. so yes it takes a lot of time to process. asian parents are also constantly worrying "what will family/neighbours/relatives" think.
i'd love to talk further via pm, i know you're on anonymous so you don't have to. i can relate to parts of your dilemma as well so hopefully we can talk more about that if you want! also, if you are a practicing muslim, i can point you to some resources too