Good or bad poem(short)?

Poetry really isn't "good" or "bad." It's just that some poems work and some don't. You do not say how old you are or how long you have been writing poetry. If you are a kid and are just starting out, this really is not a bad first piece. Remember, nobody writes their masterpiece on the first try. If you want to learn to write poetry, or stories, or whatever, the best thing you can do is READ. Read A LOT. Ask your teacher or librarian to help you find some good poetry that is suitable for your age. See what you like about it. Don't just say, "this is good." Try to figure out WHY it is good. Keep a journal so that you can practice a lot. Talk with other people who are interested in poetry (they are a little hard to find, but they are out there). I think you have some pretty good ideas here. Keep it up.