"I am boring" or "I am bored"?
I'm boring.
I'm bored.
The rule
"-ed" describes how YOU feel (I'm bored); "-ing" describes the thing causing it (the film is boring). "I am boring" means you are dull.
Adjectives ending in "-ed" describe how you feel; those ending in "-ing" describe what causes the feeling. So "I'm bored" means you feel it, but "I'm boring" means you're the dull one causing it in others!
More examples
The lesson was interested.
The lesson was interesting.
She's exciting about the trip.
She's excited about the trip.
I'm confusing by the instructions.
I'm confused by the instructions.
How to remember it
-ed = how you feel (bored, tired, excited, confused). -ing = what causes the feeling (boring, tiring, exciting, confusing).
Frequently asked
What's the difference between "bored" and "boring"?
"Bored" is how a person feels; "boring" describes the thing that makes them feel that way. "I'm bored" (I feel it) versus "the meeting is boring" (it causes the feeling).
Does this apply to other adjectives?
Yes, to many feeling-adjectives: interested/interesting, tired/tiring, surprised/surprising, frightened/frightening. Always "-ed" for the person, "-ing" for the cause.