How to get past this weird gag reflex thing?

This is really weird. It’s had it all my life (that I can remember), but I think I just now figured it out a little more.
When I eat anything that looked smooth and easy to chew, but then there’s a piece of something hard inside it (what comes to mind is certain candy bars or a piece of chicken with gristle in it), or if it takes a significantly longer time that I expected to chew it, I gag. I just can’t eat it. I usually have to get up and spit it out in the bathroom. Nobody in my family thinks this is real. I really can’t eat it. So how do I get past it?