Obviously you're not in domestic bliss, but there's really no such thing as a 'normal' family. Even if they seem perfect and rosy, every family has skeletons in the closet. Many bad things can happen in families, and what you've mentioned is very toxic, but still far from being the worst family situation in the world.
You certainly aren't being 'emo', you have genuine conflict and stress like the rest of us.

Your mother:
It's common for parents check they're children's rooms, but it's not right that she doesn't respect your privacy and property at your age.
She might be suffering from depression.
Your father:
He's most certainly suffering from depression.
Your sister:
I think you already know this.

Based on your environment and assuming also you are the biological child of your parents, it's very likely you could be affected by this too, currently or later in life.
Therapy or family counselling might help, and I recommend you get that help before you and yours situations get worse.