Engagement announcement

Please help!! My family hates my bf so I've been hesitant to get engaged even though me and him talk about it all the time. Well we just got engaged and I dont know how to announce it. My now fiance is pressuring me to post the pics and change our relationship on facebook and he is getting upset because I don't seem excited. I'm torn between being terrified of my family and pleasing my man. How should I go about this?