Need advice

I hope no one judges, I am 18 years old and I'm fully in control of my life. I'm planning on going University next year for Nursing and in a relationship. I know I want children in the future! And I'm very organise person and I plan on when graduated moving in with my boyfriend and hopefully get married then settle down. I know then I will be financially stable and in a strong relationship ready for kids. So I know my life plan I take contraceptives and he uses condoms and we spoke about waiting the right time further down the line (like 6-10 years) but I just can't help feeling maternal all the time! I can't seem to get it out of my head at the moment. Anyone got any advice? Going through same thing? I look at kids and wish I have my own and I can't get it out of my head even though I keep telling myself to stop it!!! I'm way to young for kids and I know that I just need advice how to get the idea out of my head!