About understanding...
I am 27 and I have just recently found out how understanding a family can really be. Growing up I thought that my parents would never understand problems that I had and would be angry, pissed, disown me, etc. But the truth is, even if you and others can't see it, is that a family can and maybe needs to go through difficult things together. That may be confusing, but I really believe that only 1 in 10 parents would say " your a dumb or something like that. And if your parents are that way, you don't need to be in that environment anyway and that environment is probably where your problems began in the first place.
My family acted as though we were ok and to everyone on the outside we seemed great. We would even go on family vacations and mom would take me shopping, but we didn't know each other, we just lived in the same house. When my parents found out about my brothers problems and then mine, we have actually gotten through them all and have become a better family because of it.
I really think that if you tell an adult you trust how you feel without holding anything back then you will get help. And not just someone telling you they are disappointed in you, but if you are strong and tell them what you are thinking as if they were on here and you didn't know them then they will include you in the plans for getting your self some help instead of just telling you what you need to do.