Hey all again!

I talked about the case of me having manic-depressive illness, a mild one, as the therapist told me, to the guy I consider a best friend. Well he seemed not to believe I have it. He thinks I am no depressive but rather cheerful and all. Of course, I know myself better, he told.. Sure I am cheerful most of times when we are together, cause, when depressive, I choose not to be with anyone haha.. Anyway, do you get sometimes the feeling that people don't get you? Even if they are friends and say they will be there for you no matter what and mean it 100%, they don't seem to believe you may have some kind of mental illness?? Is it denial?? I can't explain it...
Love,
F.