i'm quite similar to you, i wanted to do either medical, design or criminal justice but there's nothing by me. so i just found an opticians and i'm gonna do it there. the reason why i didn't do more of something that i love (like design or baking) is that the place you do your work experience goes on your CV. so if the employer sees that person A did their work experience in a doctor's suite, optician or any job like that and person B did their work experience in a bakery or something then they're most likely to choose person A (if that makes sense)
however i suggest doing work experience that you like (in the sense that you could choose your hobby - so say if you like riding horses you can work in a horse stable or a riding school) but only do something like that if you're in year 10 or younger because year 11 and above is where you want to work for proper jobs (like what you want to be in the future). so basically if you're young then choose something fun first and then knuckle down afterwards if that makes sense