The visual layout of the page is just too much. There are too many patterns and boxes and boxes of patterns next to boxes of color. I think you should keep that pretty blue pattern in the back, and DO NOT revisit it in your text boxes. Use a single-color in the body part of your pages, using accenting colors/header/left-hand navigation bar if you so desire.
I, too, have a website and struggle with design. I'm just not a design-oriented person. My solution is to get inspiration from other websites. Sometimes you get so caught up in your own design, that you start to lose perspective on what is aesthetically pleasing. you starting thinking that something hideous is actually pretty good just because it is better than the previous version or because you spent hours working on it.
Check out other sorority websites. I know that many of those are professionally made, but you can find some design elements to copy in yours. I assume that you're using a user-friendly What-You-See-Is-What-You-Get (WYSIWYG) program, which can actually be really fun to work with, and surprisingly versatile.
Here are some simple website designs that you can get some inspiration from:
http://www.ownspot.com/main/subpages/demo.asp
http://www.khgraphics.com/webdes2.htm
http://www.siteskins.net/samplesites.bml
Good Luck!
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