Should I speak up?

I didn't really have friends growing up. Well, I had friends at school but I never saw them outside of school. My real friends were my sister and cousins. We were all really really close. When Katrina happened we all went to Houston, and after two years, my mom and dad moved us back to New Orleans while everybody else stayed in Texas. I was 14 when we moved back. I struggled to make lasting friendships throughout high school because I didn't really know how to interact with people. My family was all I really knew.

Here we are almost 15 years later and my feelings are very hurt. The relationship I had with my family has somewhat perished over the years. My cousins have made it a habit to exclude me and my sister from their plans. They would plan trips, parties, etc. and wouldn't mention anything to us, or they would wait until the last minute say something. They've driven down to New Orleans on multiple occasions and wouldn't say a word. I found out through social media. When I was pregnant in 2018, sent them an invite for my gender reveal. I got a response from "Nani" saying, "We can't go. That's the weekend of "Sammy's" birthday trip." I was dumbfounded. I could have made the trip. They were here this past weekend to go to parades and they went out last night. I didn't find out until this morning through Instagram. I could give many more examples but y'all get it.

I've said something about it before but it was always in a joking manner to avoid confrontation. I don't think they heard me. I'm really sad right now and a little pissed off and I'm trying to hold back from telling them how I really feel, but I really want to get this off my chest. I know that it's impossible to make every single event being that were 6 hours apart driving, but it would be nice to be considered. What should I do?