Most Helpful Guy
Well odds are he's going to grow that much and be your height or taller since most boys grow until about 19-20. Go for it. The feelings are mutual which means he can look past it. Don't feel bad. He'll only feel bad if he thinks you think less of him for it.
Most Helpful Girl
My husband is about 2.5" shorter than me. I am an inveterate shoe whore, so, in actual praxis, he's more like 8" shorter than me most of the time.
And... it matters not even a tiny fraction of a shadow of a shit. Next to mah man, I feel like a teeny tiny little bitty little girl.
Together 16 years, married just under 15, and I can't remember anyone so much as casting a derogatory glance in our direction, much less actually daring to say anything aloud.