Your parents are worried about you, Kaika, that's why they're pushing and prodding. Their behavior is not helpful to you but what they need is you to talk to them and give some reassurances (which can be as informative or vague as you want). "Mom & Dad, I know you're worried about me and I appreciate your concern. I'm working on some important stuff in therapy and I'm not sure yet, but I think this might really help." And again repeat how you don't want to share details of your therapy so please they shouldn't ask, as it stresses you out. They need a little reassurance because they're so worried. Completely pushing them away won't help at all, as they will just become more worried and probably prod and poke even more.