BGLO parties

I am a little older than the average college student, however, I would like to pledge. I plan on getting involved in campus activities as well as the activities of my sorority of choice (I will be transferring to this particular school in the Fall). I am aware that you should participate in as many functions given by the sorority before pledging, however, I am not a "partier" and was wondering if it would look bad to the members of the sorority if I did not party with them. I am a lot more concerned with the community involvement and philanthropy than partying. Please don't misunderstand me, I would love hanging out and spending time with the sorority sisters, but the whole party scene (drinking, smoking, etc.) doesn't interest me at all. Is this bad?