A few things:

• Going through recruitment is not the same as pledging. In order to pledge, one must have to go through recruitment first, and then extended a bid for membership.
• No one will be able to give you a definite answer on how it's like for a Junior to go through rush because it all depends on what school you're at and how competitive rush is over there. Some campuses Juniors don't stand a chance. At some, Juniors getting bids are rare, but not impossible. At others, it's pretty common.
• You knowing a bunch of sorority members does not guarantee you an "in".
• Formal recruitment (Fall Rush, as you say) isn't about Big/Lils and presents. I joined during Informal and got a Big and was showered with presents. With Formal Recruitment, you get to meet ALL the houses, not just a few (as you would in Informal).

My advice? Study hard at your CC and keep your grades up. Get involved if you can. When it's time for you to go through recruitment, do so with an open mind and give all the houses a chance.