No. It would be a news story/event that would change history by the largest extent imaginable. To think otherwise is utter insanity. It's not a secret. You just want to believe.
It would be the biggest news story of all time if confirmed, but it hasn't been confirmed yet.
I get it. You're skeptical. Rightly so. However, the Pentagon have had some of their smartest minds looking at the evidence and they have no idea what these things are. NASA is now taking a serious interest in what they are. The Pentagon and NASA wouldn't waste time and money if this could be easily explained as drones or weather balloons etc.
It's not just the US government. Other national governments have taken an interest in these things for decades. Interestingly, in the 1950s Winston Churchill was so concerned about an encounter with a UFO and RAF bomber command that he ordered it covered up for 50 years to prevent a mass panic.
Of course, there are the loons who believe they've been abducted, or multiple false sightings, but there is also a lot of evidence that is harder to explain or has no explanation at all.
Fact is, these things do exist and have been reported, but nobody has a clue what they actually are. Could they be aliens? Sure. Why not? But they could also be something else that hasn't been discovered yet.
Out of interest, what do you think they are?