When you are used to hiding your feelings it's very hard to open up. All kind of thoughts and emotions comes in play.

There is million of people in this world who are extremelly sad but, like you, don't say it. Maybe someone you see often is, but is also too scare to say it.

You see dear one, I know by what you have been writing here in PC, that if someone would come to you and share how much they are sad, you would surely listen and give them your support. They are also other people that, like you, would listen to you if you would share your sadness and they would give you their confort. It might be IRL and it might be online but their is always people who do understand.

Give a chance to trust.