Correct me if I am wrong but Denmark has a lot of social programs, doesn't it? So your mom and dad are unlikely to starve? Plus if all you kids are at most early 20s, likely your mom and dad are still fairly young? (40s seems young to me). Do them and yourself a favor.

"Run" away from home. It will not get easier, the longer you wait. Tell your parents you and the boyfriend are moving in together and then do it. And get a real haircut.