Should I Tell My Parents That Im Adopted?

So last night my brother and his friend were talking about how im lowkey adopted. Im alright with that I guess, but I just don't know if I should tell my parents about it. I think its unfair to them that im adopted and they haven't known for 16 years. Im scared that if I tell them, they will be disappointed in me but really how could it be my fault? Like its not my fault I was adopted I was too young to realize what I was doing wrong. Anyways NS, im going through a tough time and just need some advice.. Thx

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