Hey! Thanks for stopping by! The first thing you should do is email
membership@betasigmaphi.org and they can put you in touch with chapters in your area, and get your name submitted... ALSO if you had a few friends in the area (hint - six friends to be exact) you could friendly venture - which is BSP speak for starting a new chapter.
Either way, you need to email membership. If you choose to start a new chapter, an existing chapter in the area *should* be able to help you get things set up and such - BUT - if you cannot find one to help, we are always here!
Being a KAT is fine, Im a Phi Sig and one of my chapter sisters is an ASA... so the two sorority thing is totally okay. Being 19 is not a problem either, you can join BSP at 18. You might not find a young chapter in your area, so again, starting one is a good way to be with women your age. There might be a chapter with women a bit older than you, but you may fit in well with them too, that is all personal prefrence!
I wish you luck, let us know how things go!