It's great if you have that support, I do too. But for many they either don't have it or they only have it at face value.
For some, they can share their woes and feelings but then they are expected to be quiet about it and be ok again. If they continue to be low or share their concerns. The listener loses respect for them. Not in every case, but in many.
I'm lucky that I have support and can rely on others when I am at my worst. Even if it is just to have a chat.

The worst thing you can do, is keep it to yourself. It only festers and gets reinforced by your own doubts, fears and negativity. It's always worth trying to talk, be it to a professional or otherwise.