The only thing I can think of as an explaination for that behaviour is jealousy, but even then it is no excuse. If they are jealous then they need to give you a reason for it, rather than just treating you like ****!! Do continue to be the more mature woman hun, you have done nothing wrong, and we are all very happy for you

FWIW - I had my first just after I turned 20 and I am now 23 and due to have my 3rd in June. And I have been in a stable commited relationship with my DH since we were 16. Age has nothing to do with maturity and readiness. You chose to grow up, growing up is optional, growing older is mandatory.