A common mistake for many students is confusing the "ed" and "ing" adjectives. Many students I have met have told me that they think "ed" endings are only for verbs. However, this is incorrect. "ed" endings are for both verbs and some types of adjectives.
For Example,
Interested - This is a word which shows personal feeling.
"I am interested in chess" - This sentence is correct because it shows my feeling about something.
"Chess is interested" - This sentence is wrong because Chess is not a person and has no feelings.
Interesting - This word shows your opinion of other things.
"Chess is interesting" - This sentence is correct because it shows my opinion of something.
"I am interesting" - This sentence is correct but it would be rare to use because it appears arrogant
Remember! - Interesting is much more commonly used and easier to use. Interested is only used to show personal feeling.
Other examples; fascinating/fascinated, excited/exciting