Am I too young to be a mother?

Me and my fianc� are trying to get pregnant and just want to know what people think. I'm 20 and I've been with my fianc� for 5 years and engaged for 1 year. Our wedding is booked for june 2013 and we would really like a baby before we get married so now would be the best time. We have are own home and both have full time jobs. I'm very sensible and don't go out partying, but I'm really scared of my collegues, friends and family judging me as every young mother seems to be tarred with the same brush.