This sounds a lot like "The Giver" to me, so maybe that's what it is? Here's a link to the Wikipedia page if you wanna see if it is indeed the book you're thinking about.
I was assigned to read this book in about the 8th grade too (what an odd coincidence! ). It is an enjoyable read, and the world that the book creates for the reader is an interesting one. I wish the ending wasn't left so ambiguous though. Also, I was quite sad when it ended as well.
I think the parts I liked best was when Jonas started to realize that the things that the community he lives in aren't so great, particularly when
SPOILER!!:
I only read it twice, so some of the other things that happen in the book aren't as vivid to me as that particular part.
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