I want to be a mum! But is it too early and am I too young??

So I'm 17 and my so (fiancé) and I want to start a family soon but I am on the pill due to the fact that I'm on meds for my skin! But I really want to be a mum and I get so upset when I see other people especially when it's my friends that are pregnant and here's me with no little one to look after! 
It's been my dream to be a mum since I was 13 and I knew I had to wait until I was old enough and I had a job to support the baby and myself! 
Any advice from anyone would be super helpful!