I'm not going to respond positively to the engagement announcement from my 19-year-old friend and her partner, who have only been together for six months.
Why are you not supportive of your friend's engagement?
I don't think they know each other well enough.
It is wrong not to support your friends. Getting engaged should be a happy event, and I'm sure she would like your support.
Who cares, I disagree.
I think if you don't support your friend's engagement then she might not want to be friends with you any more. You should let her know how happy you are for her, even if you don't really feel that well.