AITA? Left out of family vacation and I’m hurt..am I the asshole?

AITA? OK, so I have an issue that I would like your opinion on. I have an older brother who I haven’t really been involved with his family for the past five years. I have just started getting back involved with his family and the reason why I didn’t go all of those years is because I’m jealous of his success while I am under the poverty line and mentally ill. My dad just told me that my brother wants to take him on a family vacation to Greece and I was not invited. I feel very offended and I feel like I am being excluded out of this. Everyone is invited except for me. He and his family act like they want something to do with me, but they don’t want me to go to Greece with them like I said I haven’t really seen them much in the past five years, but I have been struggling mentally for quite some time trying to find the right medications. They say that they understand, but I’m not sure if they really do. I’m not mad at them or anything, but my feelings are definitely hurt so I am planning on not visiting them anymore. Am I the asshole?