Ugh, this just annoys me about my friend.

She says to be just happy, be a carefree person,don't care other think, love life, & live it to the fullest.You need to stop being so negative.

She also asks, & seems to get annoyed when someone says there always sad, or they can't be happy. She tells to to go be happy.

What to say when people react like this?

I won't tell her I am suffering with it-but should I tell her some facts?