I'm not sure where you live but often times there are teen hotlines or hotlines that can put you in touch with the right people. Also if you are comfortable enough with someone at school (i.e. a guidance counselor, teacher or other person in that position). Not to discourage you in anyway but if you tell them there is abuse or you are feeling suicidal or homicidal they are bound by law to report this. That being said they can be a really huge help and possibly if you agree help you talk to your parents or suggest somewhere to go. Is there someone else you feel comfortable talking to? A friends parent anyone who can listen and possibly help you find some solutions in your area or even help talk to your parents.

Yes, therapy can be expensive but your parents might have insurance that might cover this. You can decide what to tell them but given you know them figure out if they would be "freaked" or not want to help when you go to them. Do you have any siblings that could be of help in going to talk to your parents.

In high school my panic attacks were getting really out of control and I asked my older sister to help me talk to my parents about getting help. We had never been that close but she really came through for me and helped me talk to them in a way that they would understand.

Again depending on where you live there are places that do a sliding scale fee based on a few things.