Parents are different in how much they understand. Sometimes the best to do is to not expect understanding from them and take them for what they are. Even if they are not perfect, they do their best. New relations outside of home may perhaps be more fit for you because they don't know your story.

By the way: Isn't throwing a cake a bit overreacting? It is not necessary to act out the feelings, only to feel them. I'm not trying to make you miserable, only trying to tell that the society might get a wrong impression of you if you do things like that at school, uni or at workplace.

We all do mistakes according to what society expects of us and that is OK. When I do mistakes I try to learn from them, put them in "the box of past" and try to go on in the present and in the future. (I've used an amount of time to learn how to live with my depression and other).