Are you uninvited to someone's wedding?

Yes many time there are many wedding in my friends circle and family circle which I think that I should be invited there but I was not invited there but it is no problem because everyone has its own mind set and might be they don't think that they should invite us for might be there is any problem for inviting us due to some clash so I think we should not mind it if someone call does not because our golden rule says that we should must participate in someone's sadness even if we can't participate in their happiness.