Is it normal that i have to open the curtain before i use the bathroom?

I trust you've never pulled the curtain back with a gun barrel. Try it sometime, it's awesome!!

As a kid I saw a movie where a killer was hiding behind a bath curtain and he shoot a guy in the back (I think it was X-Files). Since then I was always a little unconfortable not seeing what is behind there.
So, you may be paranoid, but I see where you're comming from.

Make me a sandwich?

There is definitely someone there. For years, I would constantly do the same thing, pull back the curtain after hearing noises only to see an empty tub, until I finally figured out the cause one day.

I walked into the bathroom and heard a noise, as usual. Instead of pulling back the curtain like I normally do, I picked up my shotgun and fired directly at the shower curtain.

I then pulled back the curtain and saw a blood soaked midget under my shattered bathtub, dead. I freaked out and called the cops immediately.

It turns out that the midget was a known sex offender who would spy on people as they went to the bathroom. He had made a crawlspace in his apartment and would crawl under the bathtub and spy through a small hole that he drilled in the side of the tub. I was never charged with anything, but had to pay the landlord for the damages to the bathtub.

I suggest that you do exactly what I did next time you hear a noise.

This happens to me too but every where even when I fake showers like I need to kno what's behind me only when
Is might tho if is day is not tht much

Just keep a shower curtain open when not using a shower... :) you have no idea how common it is for people to be scared of someone hiding in a shower :)

My shower curtain is clear.