<human>: I was adopted at birth. Recently my biological sister reached out to me and wants to connect. I'm all for it, but I've had a pretty stressful life. I was raised as an only child. I was told that I was adopted, but I never knew I had siblings. (She told me I have multiple brothers and sisters). After she reached out to me I reached back and we have been chatting on (Random text messenger app). Its been about 3 days. Yesterday I told my Adopted parents about this and they didn't even blink. They told me they knew I had siblings and that they never told me because I never asked. At one point I had asked my parents about my birth family and my mother got pretty upset, I think she thought I was seeking them out and wouldn't love her as much anymore? Regardless as a good son I didn't bring it up with her again. After hearing that they knew I got pretty upset and reached out to my sister. She said she knew that everyone in my family knew about it except me because they had gotten a card from my parents one year. 

Anyways on to my question. I'm worried that I may have come off a little too strong, and I haven't heard from her in a day or so. I'm getting pretty nerve wracked. I've always wanted siblings and this is such a huge deal to me, I understand that shes had siblings her whole life and this is probably more of a bonus for her. How do I approach this correctly without overwhelming her?

Can you give me the gist of the text in a nutshell?
<bot>: I was adopted at birth. Recently my sister reached out and is trying to connect with me. How do I not let my abandonment issues / anxiety ruin this once in a lifetime opportunity to re-unite with my siblings?