As a word of comfort, you probably aren't the only more mellow grandchild of Hungarians; even amongst the guys you get set up with, who are right enough "on paper" for your parents, may turn out to be more like you on the date itself. In the end, after my (many, many) years of dating, guys can surprise you. Or, alternatively, when it your parents realize you are not hitting it off with the guys they set you up with, they will be willing to look in another direction.
Oy, pressure and food! But you may have a way out there. Since they are Hungarian, if you casually mention that constant dating talk makes you nervous, and when you get nervous you eat, maybe they'll back off (a little)? After all, chinosh is first and last.
When parents and grandparents get obsessed like this, they are being irrational, and one cannot rationalize with irrational people. Keep listening to Rabbi Yisroel Reisman (he really is the best speaker) to stay sane. Keep invoking Hashem to everyone who pressures you, and threaten them that you'll go eat an entire seven layer if they don't leave you alone. (Don't eat seven layer. The partially hydrogenated oils are almost impossible to work off).
Things don't stay the same forever. Something in their mindsets will change eventually.