[AChiOhSnap]

I agree with most everything that adpiucf said. However, even though you go to a small school, look around and honestly assess the class rank thing for yourself. If few or no sophomores/juniors got bids during informal and formal this year, that might indicate that your Greek system is relatively closed off to upperclasswomen. As a general rule of thumb, smaller schools that aren't in the South are more open to upperclasswomen and are less competitive, but this isn't always the case.

You said that you're generally shy. Plenty of shy women join sororities, but they probably made a concerted effort to be more outgoing during formal recruitment. Unfortunately, PNMs who have stellar qualities but who aren't very outgoing/are overly quiet are often overlooked during formal recruitment. Try to brush up on your small talk skills if you think that this applies to you.

Also, what REE said might apply too... I wouldn't go out of my way to emphasize your engagment/fiance/wedding plans during recruitment. I don't know whether you did during formal, but the vast majority of 19-20 year old sorority women aren't engaged and it might be difficult for some of them to relate to someone who identifies herself as "future Mrs. J." or whatever. It's probably not a big deal and I'm sure you already know this but make sure you're emphasizing who YOU are as a person.

Really those are just some minor nitpicky things you might want to be aware of, you really do sound like a stellar candidate for Greek life. I think you should absolutely try informal in the fall. Taking the time to get to know more sorority women is definitely a good idea and it will make the informal process that much easier.

And finally, just make sure to maximize your options in the fall. Go to as many informal recruitment events as you can at all the chapters that are holding events. I hope everything works out well! Good luck!