Is it normal to not cry in front of people

I'm not talking about "just tearing up" I'm talking about having crying episodes. I never have episodes of major crying in front of people, not even my own parents. I cry alone instead and I have those major crying sessions quietly so no one will hear my sadness. I don't cry often and I'm usually a happy person. So when something sad or a chain of negative events does happen I think it's all my fault and believe that I am worthless. I need to know if this is normal or if I do need help