Can Anyone Explain The Movie ‘Interstellar’ To Me? Duhh!

Remember the feeling when you are in the back of the geometry class and everyone understands the current lesson but you?  That's exactly how I felt during our recent viewing of "Interstellar."

Duhh.  That's exactly how I felt- totally clueless while watching Matthew McConaughey. (Hell, I even had to look up how to spell his last name)  Hey, I'm not shy.  I will admit freely to you that I sat motionless and dazed during this 2 3/4 hour time warp through the galaxy.

Here's a trailer for the picture.  I'm not even going to try to explain THIS!

Funny- as we left the theatre, companion (Dorrie) turned to me and said "I didn'tt think that McConaughey was believable in this part, did you?".  My frustrated response was "it didn't matter WHO played that role - I still wouldn't have gotten it!"

Simply put, what IS it about me that has such a hard time with movies like this?  I don't consider myself stupid, but I guess I am!  Everyone else was laughing and gasping at the right times during the suspenseful parts.

Sorry, but I guess I need a very simple, straightforward plot for it to sink into my feeble brain. But in the meantime, I'm trying desperately to find a way to get  2 3/4 hours of my life back (which ironically is kind of what the movie is about!)

Can anybody explain this flick to me in 100 words or less?  (And also, why do some people dislike Ann Hathaway these days? I thought she was great in this movie!  At least it gave me SOMETHING to stare at while I was scratching my head!)