If they don't intend to kick you out that makes it a little easier. It seems like with the two options you're presenting, you don't seem to be thrilled about either. Either you tell them and suffer because your mom doesn't approve or you don't tell them and feel guilty of not being transparent and you have to sneak around (which is exhausting). You also don't sound like you love living at home. Maybe you can't move out right away but could you maybe look for a job and start saving? IMO if you didn't live at home, the sneaking part would be moot and telling them might be easier since you wouldn't have to be with them 24/7. Definitely sounds wise that you're not jumping into moving in with your bf. Ultimately, you will know what will make you happiest.