At age 18, you will find out that it is impossible to distinguish between a glass of stout and a glass of malt from afar.
At face value, salt and sugar are indistinguishable. Even wheat, herbs and vegetables are identical on the surface.
So that is why you should not marry based on physical features, unless you want your features to be diabolical.
That might be in the order to marry, or your marriage may not be married. Wedlock is not a completion. When you watch marriage then you're watching or you might be cutting your life short due to the partner and if you marry someone whose mind is not for your own good then the partner mind will always go against your will and we find every means to bring that.
Be careful how you choose your partner in life even though there is no time for you still have to be very careful and diligence. You need a second sense to actually pick the rightful person of your life.