It sounds like you are entering a field where you do not have a lot of experience, so perhaps people are nervous you could be mistaken about the business opportunity.
I had a friend who wanted to start a business in a field he had no experience with. I thought he did something very clever: he found an executive leader in the field who could have started a new company in the field easily. Everyone knew him as a real authority, and if he said it would work, everyone believed him.
My friend made him a "non-executive co-founder." This meant he was a cofounder, but did not have to work at the business day-to-day (he already had a full-time job). Together, they went out and raised a significant amount of capital. My friend ran the business, and his cofounder provided strategic input and - most importantly - legitimacy with customers and partners.
My friend got a great deal - it was going to be near impossible to raise money on his own or establish himself as an authority in the field, even though it really was a good business idea. His cofounder got a great deal too: even though he was capable of starting the business without my friend, he was not that entrepreneurial and likely never would have on his own. The business was a substantial success.
If this idea appeals to you, start making a list of people in the field you are entering you believe VCsand customers *already* know about. You may not be able to get any of them, but you need to be thinking about the most influential people to make an offer of "non-executive cofounder" too. This is only a good idea of they can make raising money and signing customers much easier for you.