that is not the only problem. You barely know who you are at 25, let alone 18. Especially today - you havn’t finished your education, not seen anything
What is the rush with finding a “mate”. Precreating early? Good for you. It just means your body will fail quicker.
as a disclaimer. I am talking from a purely objective rational point of view. If you were wed age 16, this isnt a value judgement (necessarily)