AITA for feeling jealous of my brother.
I, 20, almost 21, trans male have a younger brother, also trans male 17.
I think the jealousy started as soon as he was born. I learned at a young age that in order to get attention from my mom and step-dad, I would have to act out. So, I started misbehaving, badly.

But my relationship with my brother wasn't always the best.
I was your typical bully older brother. I hurt my brother a lot when we were little, which I now severely regret as now my brother and I are very close.

My brother, let's call him Mike, is practically a polar opposite of me. He has more friends, he is better at planning for the future. He has always been the more mature of us two. But that's not why I am jealous.

Our mom, let's call her B, has always been unstable in some ways. As we grew up, we both realized this and I think we bonded over the shared experiences we had with her.

As we got older, the fighting between us slowly stopped, and we grew closer.

But here is the current situation.

B and my step-dad, let's call him J, have been spoiling my brother more since last year.

On my birthday last July, they didn't get me any presents. Not even a card, and J had signed me up for a bake sale, which I did all the baking by myself. We were at this sale place from 3pm-10pm and my step-dad bought us tater tots at about 4:30pm and dropped us off at our current place of residence at 10:30pm without dinner.

Then, for my brother's birthday, B and J come over and give him gifts. I felt the jealousy in my heart then, but I wasn't really mad at my brother, just out parents.

But this upcoming Sunday, my brother gets to go to Illinois for his Spring Break, as a Graduation present from our mom and his dad, who is my step-dad.
I never got a graduation present. I wasn't even aware when I graduated in 2022 that I could even ask for one. So, I didn't get one.

But now, B and J want to throw a party for my 21st birthday and have it be a join graduation/early birthday party for my brother.

I know he is moving to another state, but that doesn't mean they should neglect me too, right?

Am i just overthinking it or am I right to feel a little jealous?