Is it normal to feel hurt that you're not thanked for the gift you gave someone?

I don't know why I always feel this way sometimes. I went to my cousins 13th birthday which I had fun. I got him a cool shirt. I saw his best friend gave him the same shirt. When it got my my gift from him, he was like, "Oh its the same shirt. I already have this shirt. Ooh and I got $40 nice!" Then he quickly mocked on to the next gift. I couldn't believe this. He didn't even say thank you to me but to everyone else he did. I didn't make it into a big deal but I eas hurt inside. My dad wasn't. He didn't care. Maybe I didn't hear him say thanks. Am I too sensitive.