Yes, it would be a shame. Many new inventors believe that to become successful all you need to do is make a prototype, or get a patent, and then license their invention. There is a bit more to it. It is like believing that to make money in real estate all you do is buy a hammer, build a house, and then sell it. That's not exactly what happens and is the main reason why 93% of inventors are not successful.
You need more tools than a hammer and the selling is dependent on a lot of factors. There are several tools we use in determing the potential success of an invention. The tools are used in sequence: Inventors Log, Patent Search, Market Research, Business Plan, Prototype and then Patent Application.
These tools allow you to determine and prove the profitability of your invention. To be viable, a successful invention must make profits for all involved. If these tools are not used then the chances of successfully licensing an invention - and making money - are slightly worse than getting hit by lightning but slightly better than winning a lottery. So I would hold off on the loan until you can use the above tools to convince yourself and others that you are going to make money - then licensing is more definite - you will know what to expect - how much you will make - because you researched it and prepared a business plan.
Hope this helps.