Wanting to rush...Issues with parents

Hi, guys. I know there's already a lot of posts about how to talk to parents about rushing who are anti-Greek, but my situation is kind of difficult and I appreciate any advice anyone has.

I'm gonna be a junior this fall. Last semester, I was introduced to one of the sororities here on campus, and I want to pledge next semester. I really like this sorority, the people in it, and it's values. I've done my homework on them, and I've been to several of the sorority's events to see what it's like.
The sorority is much smaller than the others here. I'm a student worker and am planning to pay for the all the sorority fees if I get a bid this fall.

The problem-or conflict-I'm having is that I know my parents (mostly my mother, not so much my dad) thinks that sororities are wild and generally a bad idea due to bad hazing incidences. I love my parents, but I'm not sure they realize that I'm an adult. I haven't told them about the sorority or me wanting to pledge at all. I've been responsible ever since I went away to college (kept up my scholarship, made good grades, never gotten in trouble, been financially careful, etc.). My parents don't pay for my school, as I've been fortunate enough to get a generous scholarship that pays for tuition, room and board. They do let me stay at home over the summer and are letting me take one of the cars this fall (I'll be paying the insurance, gas, car maintenance).

They do tend to be overbearing. To give you some examples of what I mean, I wanted to get a 2nd earlobe piercing and they told me I couldn't just because they thought it looked trashy and that I still had to follow their rules. They have forced me to unfriend people on social media, just because some of my friends use social media for fun and not as a resume. I'm not trying to list petty instances, but my parents are overprotective than most parents and tend to micro-manage me sometimes.
I know my parents love me and I respect them. But, I'm old enough to know what I want and to make my own choices and learn my lessons and they don't seem to acknowledge this, which is why I haven't felt comfortable talking about stuff that goes on while I'm at college or about this.

I really want to rush for this sorority and I was talking to a couple of my friends about this, and they advised that I don't tell my parents I pledged until the day of the probate. They told me that I may just want to tell them right after the pledging process is over, because they think that my parents would react better just getting a surprise, rather than worrying about the thought of me getting hazed for 8 weeks. They also told me they think I would do better academically and emotionally during pledging if I didn't have my parents jumping down my throat about this.

I know that if I tell my parents about the sorority when I get a bid (which would happen shortly after rush week), they probably won't let me pledge (perhaps, they'll make threats to take away car or try to freeze my bank account at the worst). I also realize that if I choose not to tell my parents until the day of the probate, I'm not exactly going to look mature, as I technically lied to them by omission and they likely won't trust me for a while. I honestly don't know what's worse or if there's a better choice and I'm just not seeing it.

Is there anyone else who went through this with their family or has had experience with stubborn parents that can give me some advice? I just don't know what to do. I really want to pledge for this sorority. I just need help or advice about how to talk or deal with my parents.