My mom gave my sister up for adoption !!!

I want to find her so badly. My mother posted this year's ago and never said anything. I was 5 at the time and I didn't even realize she was pregnant. I do remember going to an ultrasound. Even saying "oh that's how u see the baby?" But it didn't click. I forgot all about it until my mom reminded me a while back. Please if this is ur birthday or if u know someone who was adopted with this birthday July 1,1999 .. I want to know her. I want to find her before I have kids. I want to know if she has kids yet. She's young but you never know... Here's our mom when she was about the age my sister would be now. This was when she married my dad she was pregnant with me at the time. I heard her father was darker so she might not look so white. But that could be a rumor. I love her so much I just want to find her. I put a picture of me here for comparison as well.