Please contact the National Suicide Prevention Hotline to discuss your issues.
I'm curious why you think leaving, against your parents' will, for two or a few weeks will solve anything -- especially since you leaving for that period of time will likely have a significant impact on your ability to pass your classes (and yes, I'm assuming you're enrolled in school).
Yes and yes. Your friend (assuming he/she is an adult) could be charged with and convicted of harboring a runaway. Additionally, since you're contemplating traveling from one state to another, it could give rise to federal criminal liability.
Your plan potentially implicates both states' laws and federal law.

