How to keep my family's trust and my boyfriend?

Okay so lets take this from the top. Im 19 and female. about 3 years ago I met a guy ONLINE! yea yea I know, bad idea from the start. well guess what, I let myself fall in love with him. so like a lil highschool idiot listening to all my friends advice I told my parents. yea big mistake. “You dont know him! He could be 40 fat and a raper!” the usual spew. OKAY before everyone beats me up. I completely understand this part right here. parents protecting their daughter. anyways. this went on for about half a year. I told them it was over and I almost ended it, but I couldnt. I loved him too much and that love only grew. so they found out again and the last thing I heard was my mother telling me that he doesnt love me and that he will never be my boyfriend. after that I stopped listening and started planning how I would never tell her anything again considering how when I first told her I ask her not to tell my dad. and of course she did. Okay so now it sounds like I hate my parents. well I dont. strangely I still love them very much. but you see as time passed I still loved my boyfriend very much. and never let him go and also have managed to hide him from my parents every since I lied to them that it was over between us. so on my 19th birthday last year. He and I met. and I was smart I brought friends. and I would like to tell you, that I’ve done nothing but fall even deeper in love with him. and he is everything… everything to me. so here’s my problem. im 19 and will be 20 this year and my parents still treat me like im a kid. I have a j ob, a car, and I go to college. im trying to show them I am responsible and maybe one day they will start treating me like im an adult. this guy, I want to be with him. I’ve only been in his presence once. we talk constantly. I know everyone’s advice will be to just “talk” to my parents and work it out. my parents are the most difficult people to talk to. they are depressed all the time and take everything to offence. so with this knowledge. what do I do from here? how do I keep my family’s trust and keep my loving boyfriend? how do I stop hiding it?