Pressured to have kids?

Sarah
Ive been married for 3 years and my family and friends are constantly asking when we are going to start having babies I'm at a point where I just get upset and say it's non of your business we don't use any kind of birth control so there's a part if me that thinks we can't have kids so it makes me feel even worse! How do I get people to stop asking? Without freaking put?