It's ok to be Sad

Why do I feel so guilty for taking time to grieve?  Why is it so hard for me to tell people I am not ok?  I always have to act like I am fine, then when I am alone I am falling apart.  This is so hard.  I know I have every reason to feel all of everything I am feeling and shouldn't be ashamed.  Has anyone else went to counseling?  I am looking into it now.