What do i need to do to become an air hostess?

for years now ive wanted to be an air hostess when i finish college or w/e, im 16 nearly 17, ive researched but haven't really found anything that helps, i was wondering if anyone could help me with where to start to begin this career and what helps to get into this career, like i know you have to be a fairly good swimmer and that. and its just panicking me because ive applied for college but not really sure what i would need? i chose travel and tourism, spanish and health and social care, and i chose music as a backup because that's one thing i am passionate about, but is there anything else i can do like any courses or something? i don't want to leave it too late to do anything. please help. Thank you! :)