Wa `alaykum as-salamu wa rahmatullahi wa barakatuh. 

 

Life is full with tests and trials for every one and this is your test that you must pass and not fail. Since there is approval from both families but delay is meant for certain matters like finishing school or getting a job, etc. then both of you must practice patience, keep away from Haram and make Dua`a’ that Allah helps you in that.

 

In your case, I do not see permissibility for a private Nikah, if you are to become a mom or the person you wish to marry becomes a father both will not approve such approach.

 

Allah Almighty knows best.