How do I begin if I don't know how to start?

Lately my well I don't know if it's "mental health" but I guess something like it has been worse.

Usually I can keep it to myself and be happy and cheery in front of people but lately it's been hard to put on a smile.

I want to talk to someone but I don't know where to start in the discussion if I did.
How do I begin if I don't know how to start?
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