Please, help me: How to know which is the right 'movie version'?

[Engage]

Hey guys, this issue has stopped me from sleeping at night so I'd DEEPLY appreciate help!

So, my issue is that when I'm watching a movie I keep thinking to myself:

"Is this the most complete version of this movie because if it isn't then I'm not really watching the version that the director wanted me to see. This means I can't make a mental note or tell other people that I've seen the movie because I haven't seen every minute of the movie's full release."

With there now being sooooo many different releases of movies it just makes me feel worse: There's the VHS release, DVD release, Blu-Ray release, pirated releases, TV versions and so on.

Thanks for any help!