Sorry to hear that your friends are giving you a hard time about rushing! I've been in the same boat, so I can definitely empathize. This is the way that I look at it: if someone wants to buy into a stereotype without even attempting to find out if the rumors have any merit, then that person is ignorant and it's his/her loss.
You, on the other hand, have heard the negative things about Greek Life and have chosen to research further and judge for yourself. Along the way, you've found that things aren't always what they seem. That makes you the bigger person in my book!
Don't let your high school friends get you down! You're about to start a whole new chapter in your life, and I'm sure that there are plenty of people out there who can't wait to offer their friendship -- minus the sarcasm and negativity! Good luck, and keep us here at GC updated!