How do I tell my parents I want to join?

[Low C Sharp]

So my grades shouldn't be a factor for my parents to tell me not to join.

Well...says who? If I were paying for someone to go to college, a 3.01 would not impress me unless she were studying chemical engineering at a top school. And even then, I wouldn't think that it was necessarily smart to add a time-consuming extracurricular to her schedule.

I would not advise you to tell your parents that THEY shouldn't consider your grades as a factor. They're going to have their own opinion about that regardless of whether you consider a 3.01 to be good enough or not. Instead, focus on the things you will do to bring your grades up at the new school, with your new sorority's help.
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Wong Amat condos