How do you make it knowing those you love will never understand?

So it's my mother's birthday. Im surrounded by family and thier friends. I can't fake a smile. With the state the U.S is in and being an experiencer , knowing the reality of existence, how can I be happy knowing they won't know or exist in the same plane I do. I want to scream at them the truth. They already think I'm crazy. How do you make it everyone. The sadness of knowing your alone and can't help those you love?