That is a shame because kata will enable one to successfully defend themselves, in many cases, in less than the 'months' it now takes you. In fact, many principles of kata are easily learned and more importantly, retained in long term memory due to being based upon gross motor responses. Certainly one can train a kata for many years, even a life time. But these are more advanced principles that, while useful in SD, are not needed for a majority of SD situations. Too be honest, if it is taking you months to teach practical self defense then you're doing something very, very wrong. Not meant as a slap in the face, but practical SD doesn't take months to learn. WWII combatives, one of the most useable and effective H2H systems ever created took about a weekend to learn. Based on gross motor skill and rote skill sets it is retained in long term memory. Boatman's edged weapon defense (I'm an instructor) is about 16 hours long and is the only documented edged weapon program that I'm aware of in the world that has the level of success that it does. And again, and even more importantly, it is retained in long term memory.
And they are all found in kata
Kata is like an onion. Peel to the layer that is useable for the situation and length of time you intend to train. But the first layer is just fine for cooking.