I agree — there are surveys that look at depression and suicide rates by profession. Doctors and bus drivers are at the top of the list. Interestingly, the performing arts are at far closer to the bottom of the list. Interesting reads here and here and here.
That bit is true, for sure. A lot of creatives (artists, designers, writers, etc) are touchy that way. Some of it is ego-based, for sure. But a big factor is the vast many people with no tact and less manners.
If a person says “I like where you’re going with that, but I wonder what it would look like if you…” that’s a…
Problem with both criticism and praise is that they’re both opinions so they’re subjective.
You don’t mention what kind of design — designing websites is not the same as designing packaging or book covers or furniture or apps or usable products. Design is a pretty ambiguous word.