How do y'all explain your OCD to people?

I haven't told my parents yet. They aren't very mental health savvy and I feel like they'll just think its that I stress out too much and can just stop. I'm a grad student who is no longer living with them, by the way. I just am kind of reeling since the diagnosis still and wanted to talk to them about it but I'm not sure how to explain it in a way that'll help them understand. Especially since I don't have contamination OCD except for a few small things -- the point being I don't have a hand washing compulsion and if they have any preconceptions about OCD it's probably the assumption that that's what it is entirely and they'll be like oh you don't have that then. And I don't want to start doubting again that I actually have it and if the conversation goes poorly I could see that being the result.