Its ok! Two words to remember. While we talk often about confidence - there comes a time in everyone's life when you just don't feel okay. And that's ok. Don't hold that feeling in - share it with others - tell those around you that you're not okay - and most importantly - tell them how they can help.
I learned the hard way that I cannot always count on others to respect my feelings, even if I respect theirs. Being a good person doesn't garantee that others will be good people, too. You only have control over yourself and how you choose to be as a person. As for others, you can only choose to accept them or walk away.