What can i do?!?

So I have been hangout/ seeing this guy for a year and my parents still don't know. I'm 19 hes 25. I want to tell my parents it's just my dad is psychologically abusive by always telling at me and that whatever I do isn't good enough. I hate that I have this guilt for not telling them, I can't move out yet because I can't afford to yet. What can I do?