Synagogues are all different and it is sad that some are so cold with its congregants not knowing how to welcome strangers. It sucks that it happens so often.
Some congregations are actually welcoming at first but just before you officially join them. That's when they start ignoring you... Once you pay your dues and building fund. 
That is why I appreciate the synagogues with people who don't approach you because I don't need to waste my time by returning to a "friendly" synagogue only to have a disappointing membership that I want out.
I just think that it is funny how congregants in these synagogues complain when attendance and participation is low.
Regarding your conversion attempt... It is part of the tradition for rabbis to turn the person away the first time to test the person's conviction. You should not take that personal since it is part of the process. Sometimes the rabbis have other reasons too. For example, say your spouse does not wish to convert then the rabbi will likely discourage you from converting as well.
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