GWT ~ There is no need to worry about whether you are paranoid so long as the voices in your head are on good speaking terms with each other.
However, as an afterthought, you are questioning your judgment in broadcasting video content in an "Adults Only" area of Yahoo's service. To gain access to this "Adults Only" area, a person must be at least age 18 or older
and have provided their date of birth when their Yahoo membership was established which gives them access to the Adults Only area.
Since you are only broadcasting video to only those within the Adults Only area of Yahoo's service, you are neither criminally nor civilly liable for the content of your video if you observe the laws and regulations of all local, national and international governments and agencies
having jurisdiction. So long as the content broadcast within an Adults Only area does not violate those laws and regulations, you can alleviate most of the doubt you might have.
This is probably not the definitive answer you might have been seeking, but it should put you more at ease if you are questioning your judgment. Given the circumstance you were in an Adults Only area of Yahoo and only adults age 18 or older may have access to the video content broadcast within that area of Yahoo's service, an individual who represents themselves to you as a Non-adult or Minor Child via an IM within that same Adults Only area is
probably either attempting to intimidate you or they may be using the tactic of "Phishing" to troll for online internet child predators.
My advice is to report these types of contacts to Yahoo since a violation of the Yahoo Terms of Service (TOS) may have occurred on the part of the person who initiated contact (IM) with you within an Adults Only area of the Yahoo Service. So long as you don't violate Yahoo's TOS and you observe the laws and regulations of all local, national and international governments and agencies having jurisdiction, you are neither criminally nor civilly liable for what others may do or represent to you.
I would caution everyone that the tactic of "Phishing" or trolling for online child predators is an active and aggressive measure some individuals and/or organized groups use in outing or the unmasking of online child predators. These individuals and/or organized groups operate as Cyber Vigilantes or self-annointed vanguards of morality. Law enforcement agencies, already badly strapped for scarce resources, are increasingly reliant upon these people and their organizations to do the job they (Law Enforcement) are duly charged and authorized to do by the controlling authority -- The Law. This, for the most serious of all reasons, is a prescription for disaster and demonstrates why people are increasing mistrustful of law enforcement and investigative agencies. Vigilantism or self-annoited vanguards of public morality is not the solution to the problem of online child predators.
The issue of entrapment is important and relevant, but only if an individual was coerced, intimidated, or the threat of force was used to commit a crime they would not have committed under any other circumstance. In legal proceedings, it is the legal definition of entrapment that forms the basis of an active defence which obligates a defendant to prove his/her innocence of a criminal charge.