What does 7 and 4 Mean in My Life?

Unfortunately, marriage circumstances and disturbances are outside the realm of my practice of numerology. I can speculate, but not calculate with an acceptable degree of certainty.

However, I can respond about the numbers you're seeing.

The number 4 and the number 7 each are at three places in your numerology chart in addition to being in your birth date.

The number 4, your birth month, is your heart's desire number, your life path number, and the number of your first life period cycle.

The number 7, your birth day, is your cornerstone number (the first letter of your name, as you mentioned), your destiny number, and the number of your second life period cycle (which begins at year 2023).

This tells me you're very much focused on building a secure foundation for the future. The marriage unknown may be disturbing because it spoils your focus, prevents you from putting your whole attention where you feel you need it.

It also tells me you tend to be introspective, finding solutions to personal problems and feeling little need to consult with others. The marriage unknown can't be solved by consulting only your inner wisdom because the decisions of other people will have a direct effect on your life — and any solutions you may adopt temporarily. It needs to be solved by talking with those who may make decisions unacceptable to you.

I hope those observations will provide some meaning for you.