Even in my marriage of 11 years, with three kids, our children come first in our relationship. They are the worlds that we revolve around, and everything is based on their well-being. Children are raised by adults: we teach them, we help mould them, they learn by watching us and our interactions. It's difficult to understand the love a parent has for their children without having a child of your own - I agree with that. But it doesn't mean you can't learn it. Get to know your step-kids. By knowing them, you'll also learn much about your husband and you'll join in on their lives together. There is room for everyone and happiness can be even more full with the love of children.

You should not be in competition with your husband's children. They are his children and need him to be their father; that's his fatherly task. He also has another "job" and commitment to his wife, you. He must know and tend to your needs and fulfillment; his job as a husband. All husbands need and should do this step children or your own. I wish you good luck! 

NOBODY IS RIGHT. EVERYBODY IS A PERSON AND HAS FEELINGS. HONESTLY ITS NOT SAFE TO COME BETWEEN A PERSON AND THEIR CHILDREN, BUT HE NEED TO UNDERSTAND THAT YOU ARE HIS WIFE AND YOU NEED TO BE CARED FOR TOO.