It sounds like you are having a great recruitment at PSU! Coming into prefs, continue to keep an open mind. As you go to rank your final choices keep that open mind to the possibility of being a member of a few "top choices."
Don't rank a chapter you truly could not see yourself as a member of, but also remember that all of the PSU sororities include members from various backgrounds, majors and interests-- you can certainly find your niche in a group of 50+ women and you need to remember, too, that you aren't going to like all 50 all of the time no matter which chapter you may join!!
Keep a "Top 3" list in the running and remember that while the chapter you join become your "sisters," you can be friends with many "sisters" and other chapters, as well! This is your opportunity not only to join a sorority, but also the Greek Community.
Have a wonderful time and congrats on so many great invites and your positive and down-to-earth maturity!