If this is a colony of an NPC sorority you likely did nothing wrong. Expressing interest is a good thing! Now, if you said you are pledging, you are going to be president and you want the board members to be Amy Sarah and Lisa, then yeah, you probably went overboard. But the colony people desperately want to find out who the interested collegians are so they will be happy to have received an email.
If it's not a colony and you're talking about informal or formal rush, you may have overstepped a little, but even then expressing interest once isn't deadly. Twice a day, why haven't you responded to me!!! (when they are possibly not allowed to), etc. isn't cool. But a Hey, I'm looking forward to rushing! would be seen as enthusiastic, not creepy.
In short, I wouldn't freak out about it.
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"Traveling - It leaves you speechless, then turns you into a storyteller. ~ Ibn Battuta
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