You need a lot, a whole lot of work on the basics of boxing. This book is the best "How to..." book about boxing ever written. I would go through it chapter by chapter, and do all the drills until you get good at them. he covers everything from footwork to how to throw punches, to how to avoid getting hit with punches. best of luck.
http://jkd101.com/jkd_free_stuff/Box...in_Haislet.pdf