Giulia,

It’s really tough to be the outlier in a tight, closed community.  I think of the Christian Fundamentalists, Amish or the Republican Party here in the U.S. as examples where having different opinions, values, views, etc. are not tolerated.  This is typical of human behavior and evolutionary psychology explains this phenomenon for tribal/cultural mindsets.

How to stop talking negatively about the community?  You can focus on what pluses the community brings to you.  What are the benefits, what are the good things they have done for you, and how your children have benefited from being part of it.

Create a gratitude journal just about the community.

Mark