This is actually a very interesting question! As I am writing a story which also includes this same type of super powered population, I think I might have some advice
Firstly, let's actually look back into history. These dreams of having powers and supernatural abilities are actually as old as humanity itself. With witches in the Medieval ages, to Gods, tales about miracles, and all of these supernatural legends told throughout generations. In real life of course, we know these aren't real. In a fictional world, people also think just like us: they think it's not real, that they're just legends. But what if in this fictional world, these events were actually real? What I mean by this is that it's impossible for an entire population to completely hide their nature. There obviously are going to be several people leaking the secret. Yet, if throughout history humans still don't think they exist, then that means that they were able to maintain the secret.
The human psychology
The human psychology is quite a complex thing, and it's pretty clear that people are afraid of the unknown. And if people do see supernaturals use their powers, no one would believe them; they would be called crazy, heretics, or attention-seekers. However, if government officials come across such powers, things might get tough for the supernaturals. However, I don't think the government would deliberately tell the public about supernaturals, as it would cause panic, and so this information might be classified. 917
However, this still isn't good for supernaturals, they could be experimented on in labs for example, or taken away by the government for unknown reasons. Another problem would be if a supernatural uses their powers in public, with enough witnesses to make it believable. This is probably the worse case scenario, since both the people and the government would know.
Average Population
Take for example New York City, with around 8 million inhabitants. I think a good number of supernaturals in that city would be about 100 supernaturals. Now take that, and compare it to other big cities, who would also have about 100 supernaturals in them. Of course, some small villages might have one or two supernaturals in them, or maybe none at all, depending on the size of that village. Supernaturals are rare, but there are more than people think.
Hiding from humans
If realistically most supernaturals wanted to hide their powers effectively, it would be better for them to live in small villages, where there aren't enough witnesses to make a sighting go viral. I think that in order to hide their powers, supernaturals wouldn't really be able to have the most normal of lives. Maybe getting a simple job would be better than being a celebrity, since there are less risks of getting discovered. Children should not be sent to school until they can effectively hide their powers - or not even be sent to school at all, but be home schooled instead. For marriage, it would be a lot safer for supernaturals to stay together and not mix with the humans, even if they can reproduce. If it means hiding their powers at all costs, these are probably the best safety measures. 917