My casts were doing the same thing, what helped me a lot was getting on youtube and watching some casting videos. There are several on there that are good and explain what and how to do it. Then I just go out in the back yard and I practiced a lot with it. Once I did that my casts were much better than before and I think part of my problem now is the cheap rod, reel, line combo I have. Waiting for xmas to get my new stuff and see if I am correct about that.
Practice, Practice, Practice!
Good Luck and keep having fun!