Should I tell my crush I like him?

I have liked this boy guy for a bit more than a year. I see him everyday and when I see him I smile and blush and he smiles back. I just want to tell him so bad but I don’t know if I should. My sister says not to until I become more of friends with him and my friends told to me tell him when Im ready. So I would really appreciate some other people’s opinions on this. Please help!!!

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