I don't know as if I'm good, but I've always loved color. I seem to do ok. All my friends tell me I have a great eye for color. I know what I like together. If I choose something, and when I get it home, it doesn't look right, I either go out and buy more (
), or I find something in my stash. You could try the color wheel. I don't use it, but there are many who swear by it. Also, if you do scrap quilts, you can put anything in those, and they'll blend.
Another suggestion would be to get out your crayons or colored pencils and make samples of colors you think go well together. Take those along with you to the fabric store.
Have fun!