There is no shame in crying at the casket. To be honest, when they shut the lid on my beautiful baby sister, I bawled my eyes off. I couldn't leave the grave site for another 1 1/2 hours after everyone else left.

By me crying this is significant and I assume that it is the same with you. I never have cried in public before then or after, but I am proud to say that I bawled like a baby at that moment.
Good luck,
j3k