Sorry to hear you don't have much support I guess the only persons opinion that matters is dp have chat with him and tell him your feelings it took me a few months of deep one on one chats with dh to get him to come round and alot of crying and then it took us 10 months to conceive so mayby tell him it's normal for it to take up to a year for a young healthy couple mayby he will feel less like your gonna get pg straight away , also I find males worry more about the provision side of things so good to go into discussion with a plan eg paying for baby gear, everyday disposable items, food, maternity clothes and money for scans and dr visits , and maternity leave plans show him your serious and not just clucky

As for everyone else if they think your too young just ignore them

Also feel free to join the pre-ttc thread a few have the same problem