I worry about this too, not just with dating but with meeting anyone. Sometimes I have to lie and pretend my dad is perfectly normal. I know he’s still around and fighting so it’s different but I feel like this is completely normal.
I never know the right time to tell people and I hate that look they get as soon as they know but it’s not something to be ashamed of at all! Hopefully the good people out there who find out will simply support you more.