Birthday on Friday but idk what I'm doing wrong.

My birthday is on Friday and I got a job offer! I'm excited although I feel like my baby brothers birthday is being glazed over mine, ours being fairly close. I feel as if my birthday isn't just as important as his. I will legally be able to work now and I feel like that information isn't as important to my family as it is to me. I have a feeling that my mom is overall forgetting mine by how some of the past conversations that we have had in the recent week, such as "I'm excited for this Friday" and her always asking "for what?" and when I tell her she replies with an, "Oh, yeah." like she forgot that it was happening. I just don't know if I'm being the asshole due to my feelings. Maybe because im the oldest? I don't know.