Not wanting to go into the restaurant business is a far cry from thinking that one is not being able to be married.
The latter situation, “I can’t get married”, indicates that the person would really prefer to be married, but he can’t for some reason so he is picking a profession where marriage is not possible.
The problem arises when the man gets ordained, starts his work at a priest, and then meets women, some of whom may be available and attracted to him. He may very well end up deciding he never truly had a vocation and would rather be a husband than a priest.
We have had an ongoing problem in the priesthood with men leaving the priesthood to get married. If someone would truly rather be married, they should do us all a favor and keep looking for a wife. Who knows, they might meet the right lady when they are 35, 40, 50, or 60, and then they won’t be facing the bad situation of having to bail on their priestly vows. My own father did not meet my mother and get married until he was 38 and had not had any significant relationships before then for various reasons.