Please help me😩

I’m seeing a guy on the down low. No one knows about it cause he’s a friend of my dads friend. It’s definitely a secret. (He’s 45 Im 25) It’s been mostly about sex at his place for the last 2 weeks but HE INVITED ME TO DINNER TOMORROW. OUTSIDE. I have feelings for him so i said yes. He picked the place and planned the whole thing. If my dad or my mom or my co workers see it it’ll be extremely odd. What should I do? I don’t wanna cancel plans or reject him