Help Telling Family

So, I have been seriously considering joining a sorority this past year, especially since I will be starting my Freshman year in college this August.

However, I don't know how to tell my family this. I know, it sounds kind of weird that I don't know how to say it, but I was never the really girly-girl or extremely social one like my sister. Sometimes, when I tell my mom that I want to do things that I usually don't she tells me that I don't.

This has happened for so long in my life. I am afraid that she will think that I am not the sorority girl type and/or laugh. I guarantee she won't take me seriously. She's already against the idea because the membership for my second cousin was about 1,500 in just the first semester and my family doesn't have that kind of money.

Anyways, the point is, I wanted to know some things that I can bring up to help persuade her to let me at least try to rush and support me. Or if anyone else has been in a similar situation that can help. I am just afraid to embarrass myself because when I tell her these things, she usually thinks I'm wrong.

Also, are parents involved in the whole process and sororities?

Thanks for all the help!

-Krissy