18 and TTC HELP!?!?!

Beth
I'm 18 and TTC, for some people I am way to young to have a baby, I've had comments before saying I'm stupid for my decision etc... I'm engaged to someone that I am completely head over heels for, the only problem is, I've been trying for 11 months and I've convinced myself I'm infertile! I have sexual intercourse quite a lot, I feel like I'm doing something wrong 😳 I used to have the worse pains during periods and really heavy periods too!! I'm severely anemic, could this be a problem? Any opinions? To everyone who is TTC, I hope all goes well and baby dust to EVERYONE ❤️