You're allowed to be mad about Things, sometimes. We all are. Unrealistic schedules, work being undone, time wasted, money wasted, something breaking, someone being a jerk, life in general.
But of all the things to be mad at, you're not allowed to be mad about just feeling left out.
Communication is on you. If you want to know what's going on, ask. Set expectations. Or even better, be PART of the story. People tell you things when they trust you, understand that you need the information, or most common, they know you can help them. They'll naturally keep you in the loop if those things are true. If you're making enough contributions, they can't forget about you.
If one person routinely leaves you out, talk to that person. Maybe they have room for improvement.
But if you're screaming at a whole room full of people that they should have told you something, the problem isn't them. The problem is you.
Plans change fast. Everyone is doing their best to talk. So if you JUST learned something, that's great. Now you know. Let's move on.
Are we moving forward? Yes? Good.