Frustrating

My husband and I have been together since we were 17, got married in September of 16’ and started trying for a baby in June of 16’. Every doctor I’ve been to just says “it’ll happen” won’t help, nothing. I finally found a doctor an hour and 45 minutes from me, she was so understanding and figured out nothing was wrong with either of us! & and gave me medicine to help me conceive. Well today I had an appointment with a new doctor in my town and she asked how long I’ve been trying and I said 3 years and she laughed and said “you’ve been trying since 18?” I don’t understand why it matters. I hate feeling judged, I want nothing more than to be a mommy. I’m tired of people making me feel bad because I’m only 21.. I know so many 21 year olds with four kids. I know our time is coming but I feel like I’m failing as a wife because I am 21 and with everyone I’m around, I feel like it’ll never happen for us...