I would look so stupid

You ofen hear people saying, "I don't know if I should do this, I would look stupid" or something like that.

It indicates that nowadays, people are afraid to do something, if they are unsure what everybody else would think of it. And if they are convinced that, what ever they do, would look silly, funny or stupid, then they are afraid of what other people would think, and they then choose not to do it. Just to be on the safer site.
And if they are supposed to do something they know they are not good at, they can tend to give up in advance, and then it's clear that whatever they end up doing, will go wrong and everybody will see that they haven't done anything to encourage it. And therefore it will look kind of silly, and noone will be impressed.
On the other hand, if they instead try to do it right, and take the assignment seriously, then people normally get pleasantly surprised and impressed. And you won't look silly at all.
As a bonus, you will feel much better afterwards, because you have done it, even when you were certain that you couldn't.

In reality people get impressed when you do something and try, no matter what your skills are, just the fact that your'e trying is impressing and admireable.
Otherwise, you will just look insecure and unserious, wich never look good.
Nowadays all to many people think to much about what other would say, and ends up not trying at all, when others actually would be impressed, just because you try.