So let me get this straight Golfy. No sarcasm here, no condescension, I'm trying to pin this down as accurately as possible. You have a claim, the onus is on you for evidence. Now what you're saying is you can send telepathic words/thoughts/messages to people. They will receive them, however virtually all or the majority of people or nearly everyone or otherwise a large number of people simply lie about it? They are either scared or are maliciously withholding from you the fact that they did receive your telepathic message?
Further, you're saying the only evidence you have of your ability is using complex testing methods such as using bio-feedback? You're saying you have used bio-feedback machines to see if someone was mentally "acknowledging" your telepathic message? You're saying something happens on the machine's readings that makes you believe they can actually receive your telepathy?
If this is all correct then the problems are twofold. Firstly it is cynical, delusional and irrational to assume no one on this planet would be honest and write down what you send to them telepathically. If you are able to do this there is no reason why any person would lie. When you say this you are throwing up a big red pathological flag. When people hear such a thing they in all logic and reason question your mental health. It is more than reasonable and logical to say there are more than enough people on this planet who would not lie about such a thing. They have absolutely no good reason to lie about it. Are you familiar with Occam's razor? It's far more simple an explanation that you do not have telepathic abilities, rather than the explanation that you have these abilities but that everyone is out to get you and will not tell the truth about receiving your messages.
The second and final issue I have is that you're assuming bio-feedback and polygraph testing can prove this for you. They cannot. There is no science to this, there is no evidence to this. You are looking at arbitrary data and saying it proves something it can't. A spike on some bio-feedback machine does not prove a person has received your message. There is no machine designed to tell if a person has received a specific telepathic message from you. The machine is probably registering some kind of data because the person is psyching themselves into "attempting" to receive your message since they are probably good natured people giving you the benefit of the doubt. As for polygraphs there is absolutely no credible scientific link between the vital signs it reads and the act of lying.
For that matter, if people are as dishonest as you say they are, why should we trust a machine that must be calibrated by people? Could they not "rig" one of these devices to your detriment? In that case why attempt this? Or are you saying you should be able to provide the machinery from your personal collection? In that case how can we trust you to not rig said machines for your benefit? Your attempt to remove the "human" element from this equation and process actually leaves more room for human error.
It basically comes down to this: Either everyone in the world is lying to you, or you are lying to us or are otherwise mistaken about your "abilities." I think the latter is the most reasonable possibility. I think the former is an exercise in paranoia, irrationality, delusion, cynicism and denial.
I don't speak for anyone but myself, but I'd say if you really want to prove your ability you need to drop from any proposition for testing these pseudo-scientific devices, as well as these overly complex and flawed testing methods. If there is no one in this entire world who you can trust to be honest about your ability then you have absolutely no way to prove it. I would really pity such a depressive worldview, though, and I hope you agree to one of the more reasonable methods suggested thus far.