Should I tell my parents that I know I am adopted?

Ok well I just found out recently from my sister-in-law that I am adopted. But I am really scared to tell my parents because I don't know how they are going to react. I mentioned it to my mom years ago that I had suspicions but she got a little upset and told me no. Everybody is telling me to tell them but... show more Ok well I just found out recently from my sister-in-law that I am adopted. But I am really scared to tell my parents because I don't know how they are going to react. I mentioned it to my mom years ago that I had suspicions but she got a little upset and told me no. Everybody is telling me to tell them but right now i'd rather not. Should I tell or just ignore it?
Update: By the way I am 18
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