Does reading some of the posts on this forum ever make anyone else feel stupid, or is it just me?
It's just you. 
The problem is your attitude: you think that not knowing stuff makes you "dumb". It doesn't.
If it's really important to you to know everything about a subject, you need to get out of computing and switch to studying Latin. If you don't, you're going to be stuck with encountering things you don't know for the rest of your life. There are millions of people out there inventing new stuff every day, and they're producing it faster than you can learn it.
When I first decided to enter the field, almost 40 years ago, my parents were concerned that I would get bored. As it turned out, they were right. But, fortunately for me, by the time I got bored with mainframes, all those busy folks in Silicon Valley had invented the microprocessor. And the personal computer. As lots of other folks started adding new sensors, and new peripherals, new possibilities arose.
Rather than feeling "dumb", you should think of yourself as simply as a "beginner" who's entered a target-rich environment full of learning opportunities.