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The -ing ending tells us that the subject causes the situation. This film is boring. Your friend is very interesting. Yesterday's trek was exciting. The -ed ending tells us that the subject (usually a person) is on the receiving end. I'm bored by your talk. Tell me more; I'm interested. They'll be excited to see us again.

Hi! I'm Ron in New York, USA and I am a communications engineer. I like very much to make new friends all over the world and to help people improve their spoken English. If you want to improve your English, I will be happy to help you! And if you want a new friend, lets be friends! :) My Skype: ron.jenkins86 My QQ: 1990992857

Yes, Ms. Silva, be very careful. If you say, "I am borING," then you must be a very honest person, for that means that you bore other people. That is, when other people listen to you, they become BORED (something like "tired"). Of course, no one wants to admit that he is boring! We all think that we are excitING (we excite other people). When your favorite pop star comes to town, you are excitED by the news.