I want to start a family & so does my boyfriend

My boyfriend have been dating for 5 years, high school sweethearts. I'm barely 20 he's 22. I want to start having children. The only problem is his family he has older siblings and his sister and brother both want to have a baby this year. If my boyfriend and I decide too they will only think we are having some type of competition. They are competitive and very dramatic people. I think it's best to have my children next year, although I want to start my little family soon. I want to say "f it! It's our lives!" But I also don't need the drama that will happen.