I feel bad, but I'm going to lie and tell everyone I'm fine.
Is it because you don't want to be the center of attention?
That's right. That brings its own problems.
Your friends probably want you to be truthful about how you feel. They may be able to help, or at least provide some comfort.
Why do I need to confess my feelings? They are my feelings and they can't do anything about it.
It's not that they can or cannot do anything to help you. It's just they can support you better if you are being honest.