My children’s new sibling

Hi just coming to ask to see if I’m just being an awful person or if this is normal to feel in my situation. So my kids dad has just had another baby, our youngest is 10 months. I didn’t really deep the situation till it was born and when I found out my heart literally sank, and not even because he had a baby, it’s because it was a case of my children not being brought up in a home with there sibling and it was just so sad, even writing this it breaks my heart for them. Baby’s 3 weeks old and they’ve only seen pictures and unfortunately that’s going to be all it is as dad doesn’t want us mums mixing together or meeting each others kids, how awful is that? My heart genuinely breaks for my children, they don’t know any different they’re both babies still but having grown up with 6 siblings I’ve never met it’s sad as fuck. Now I keep getting people say to me oh they look so much alike, and idk why but it makes me sooooo mad like 1 I find it rather insulting because my kids look like ME , 2 the thought of my kids looking like anyone but myself or dad just upsets me because dad Denys them looking like me AT ALL but you wanna say your next kid looks like them it crazy to me LOLLL , anyway I suppose emotions are high it’s a lot to take in but I’m so angry for my kids and completely heartbroken. There’s a lot more to it just we’d be here allll day , just wanna know if this feeling of anger goes away so I’m not hating on a baby and it’s mother or if this is my life now