Thank you all for all your replies and advice I'm glad you guys aren't mad, I just thought you'd be since we just got a new kitten and is already giving her back to the shelter.
Well, we just brought her back this morning I do miss her...but the lady at Petsmart said that it was alright too. We are going to get a new cat too, but definately one that's over a year old. I think that maybe Cinnamon was just too crazy for us since when Blueberry was a kitten, he was really shy?( Well, he was sometimes )We saw this cat there that was about 2 years old, and she's a female. She's medium hair I think, and they just found her on the street not too long ago. She's a brown tabby, with white paws. She was sooo sweet, she kept on rubbing her head against the cage when we walked up. I also held her, and she wasn't afraid. But they don't really know how well she gets along with other cats.
But I think that my mom wants to get another Persian. If we get a Persian kitten from a breeder, I hope it'll be ok. Since Persians are very laid back and everything.
But if not, I guess the adult cat from the shelter