Three is also an extremely powerful number, mathematically.
Three is the first odd prime number
Three is the first unique prime due to the properties of its reciprocal.
Three is the second triangular number and it is the only prime triangular number. Three is the only prime which is one less than a perfect square. Any other number which is one less than a perfect square will be the product of the numbers one more than, and one less than, the square root of said square.
Three non-collinear points determine a plane and a circle.
Vulgar fractions with 3 in the denominator have a single digit repeating sequences in their decimal expansions, (.000..., .333..., .666..., .999...)
A triangle is the most durable shape possible, the only "perfect" figure which if all endpoints have hinges will never change its shape unless the sides themselves are bent.
etc, etc, ad nauseum.
http://en.wikipedia.org/wiki/3_(number)
As for my life being organized in a triad? Things happen to be in "ones." Rarely do things happen twice, and even more rarely they occur three times.