Telling family

I'm really struggling with telling people that I'm quitting. I feel like if I fail then the people around me will be disappointed, so it's better to keep it quiet to avoid that. If I do succeed then I can be proud then. I know people say you "can't think like that", but this honestly is a pretty meaningless phrase to me. I've never really understood how people just refuse to think a certain way. Am I just making excuses to not quit? I'm truly sick of all the impacts it's having on my life, but i still have a large part of me that just wants to hide away from the world and get high.

I'm on day 2 of withdrawal. I fucking hate it.