Do I have a right to feel upset at my boyfriends sister?

Lexih201216
On my boyfriends sister birthday I got her a gift and wished her happy birthday. She didn’t say thank you to either of those and I thought that was rude. It was my birthday yesterday and she couldn’t wish me a happy birthday. I don’t know if I’m mad over nothing or I have a right to be angry. Like I’m being nice to her and I don’t know why she is being rude to me for no reason. The reason it bothers me is because it’s my boyfriends sister.
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Do I have a right to feel upset at my boyfriends sister?
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