[violetpretty]

If you want to join a sorority, you have nothing to lose by trying and preparing the best you can. Get as many recs as you can, get the best grades you can, but know that because you are going to a reasonably competitive school, despite having 2-3 years left, your class standing may still be a negative. Understand that despite recs and all the preparation in the world, it still might not work out, so you need to be emotionally prepared to deal with that rejection.

Being a Theta legacy could only give you a legup in Theta, not to the other chapters on your campus. As a senior, you need to be open to every chapter to have a shot at being Greek. (Or at least don't cry about how you can't be Greek if you turned down a bid/invite.) Personally, I think a PNM who is a legacy to any NPC is more likely to be a good member because she is more likely to understand the obligations and expectations of membership. Others may not feel the same.

Like Blondie said, your best bet is to fade into lurkerdom, read the stickies, etc. You've outed yourself as a Theta legacy and fourth year student in Fall 2012, which makes you pretty unique. If you say something stupid/offensive on GC (not saying you would, but hey, it can happen to the best of us), it won't be hard for the wrong people to find out who you are. Anyone can read these boards, no sign-in required.

Good luck to you.