Question...

So I have a question. I'm 18 years old and I want a baby very badly. My parents don't want me to have a baby till I'm much much older. Every time I talk about my friends having babies or being pregnant they always say the same thing which is "well that won't be you for a very long time". They moved 4 hours away from me back in May and I moved in with my boyfriend of almost 3 years. I'm just scared to even mention it to them that I want a baby. And if I ever got pregnant I would be terrified to even tell them because I'm scared of what they would say. If anyone has had a baby at a young age how did you tell your parents you were pregnant or you wanted a baby? I'm just so scared because I don't want them to be disappointed in me. Any advice would be great.