I don't like the implication that mental health is just feeling good. Maybe if more people would read and understand the news, and feel bad about it , they'd be willing to do even trivial things like wear a mask. In my opinion, good mental health should be considered to be that your feelings align with reality. If reality sucks, it's not mentally unhealthy to feel bad about it. Feeling bad should spur making changes…
If you were paying close attention to the news in Feb-April, you were being told not to wear a mask.
Our understanding of the way the virus is transmitted changed quite a lot in 6 months. At some point we thought it was mostly spread by direct contact; then by droplets; now we believe it is airborne, to a certain extent. Governments also had the incentive to limit use of PPE to critical workers because of the short supply. It was also obvious that several governments were clueless. So yes, you were told not to wear a mask, whilst at the same time you were provided with facts that contradicted it. This was obvious if you were following the news, particularly the evolution of the then-epidemic in China, Taiwan and South Korea.
Well, for that you need to follow real news, not Fox, the Mail, or disinformation campaigns spread by social media. You also need a grip on how science works, because journalists won’t explain, and often don’t seem to understand.