I need support.

Me and my husband are TTC #3 for me and it would be his first child. We have been TTC for 14 months now and all with no luck. We have done EVERYTHING. Every time I see a pregnant lady or a positive test I actually get jealous. I really wish I could give him what he wants but nothing has been working and I'm only 21 so no doctor will take me seriously right now. I really want this. I want to have all my kids while I'm still young. I just don't know what to do.