Can I get a statement from lawyer protecting my friends/family from blame when I end my life?

You probably can't. You can make your wishes known but that does not necessarily prevent them from being held responsible. Talk to a lawyer in your area if you're unsure.

But first, please talk to your doctor.

Pref Shri, a psych
Meanwhile I'd hang in there 'cuz things can get much better

What has already been said above. You most likely can't do anything about it.

I would urge you to speak with a doctor as well. be it your pcp or going to the er and speaking with someone there. A great many people won't think of the er as a option but it is. They have people you can speak with or help you in finding someone that you can.

Suicide isn't a answer to a problem. It is a last resort when all other things have been tried and fail.

But even then there might be some hope

you should not be having these thoughts, hopefully they end

"How do I protect them?"

By not putting them through a heart wrenching experience, like dealing with a relative's suicide.

You seem to care about others.