Onions and more onions...

I don't know what my problem is but I cannot seem to grow onions for the life of me. I have tried so many times and I keep saying that I am going to give up. This year I decided to try once again but instead of using bulbs or seedlings I am going to use starts that I bought from a company that specializes in onions. My plan is to get them in the ground sometime this week and cross my fingers that something actually grows for a change. I am also going to be trying to grow leeks for the first time. I realize that I can buy onions very cheaply but I hate to be beaten by a plant and refuse to give up until I have tried every possible way of growing them.