you r a bachi 
i will strongly suggest you not to marry with him. not even after 3-4 years. cuz it will be too much to ask a 23 years old lover to take care of the things. cuz not only its you, but also his parents, his sibs and then children.
and since you were your parents only child, the chances are you are quite a princess :p.
and instead of waiting for 3-4 dreadful years you will spend in his memory and ruining your career, its better to get marry right now.
the problem with many girls is, they have sufficient resource of education, but instead put effort of making yourself a better person they wana rely on their husbands to not only financially support em but also on ethical and moral issues.