smileyface: You have a very good attitude towards finding your bashert. Hashem should help you find your zivug hagun b’karov!
As far as you classmates are concerned, I would say that when they avoid you, they are feeling uncomfortable and don’t know what to say to you, so they just try to get out of the situation however possible. If you do bump into one of your classmates, take the lead and just start speaking naturally to them about topics that are comfortable for you.
I’m sorry that you felt left out at the class reunion. But try to understand that reunions are occasions to “catch up” with each other, tell others what’s going on in your life – and husbands and babies are part of what is happening in their lives. Now, they should be sensitive to you and make sure to show an interest in what you are doing, and they should understand you haven’t yet reached that stage of a husband and children, but there should be understanding from you, as well.
Also, please see the recent thread regarding a new shidduch website called http://www.shidduchworld.org.
Hope this helps you and hatzlochoh rabbah!