Career advice?!

Looking for some guidance because I don't have much life experience. Anyways, I'm a dental assistant right now and I went to school for it. I've been doing it almost a year now. Originally I planned to go to school to be a dental hygienist... well, I was looking into school at a community college and I think I've changed my mind. I think I would like to do something in human services. I told my boss originally that I want to be a dental hygienist and now that I might be going to school for something else, idk what to tell him. My parents are like "NO DONT TELL HIM, HE WILL BE PISSED" okay well eventually he will find out... he is pretty cool compared to most bosses...what should I do??? Should I tell him anyways? I just need any advice I can get.