Having certain numbers in mind, like your birth date, is likely to make you notice those numbers more often in your environment. In your case, it is specifically on a clock. But it could be other locations, as well.

Seeing the numbers in the environment makes the numbers more likely to be thought of, which then reinforces the likelihood of seeing them in the environment.

The number 12 is a number of taking the initiative in social activities and a number of doing new things with artistic expression.

The number 18 is a number of taking the initiative in organizing people to accomplish great goals that benefit humanity.

The number 12 reduces to the number 3 (1+2=3). The number 18 reduces to the number 9 (1+8=9).

Your numerology chart has many 3's and 9's. Each of the five major numbers and some of the secondary numbers are a 9. Many of the secondary numbers are a 3.

Your heart's desire, destiny, personality, life path, and power numbers are all 9's. Of the four pinnacles there is one 3 and two 9's. Of the four challenge numbers, there are three 3's. Of the three life cycle numbers, there is a 3 and a 9.

Because the 12 and the 18 reduce to 3 and 9, respectively, read about the essence of the number 3 and the essence of the number 9. The articles attempt to impart an understanding of what the numbers mean. I think you'll find aspects of yourself described there.