Not getting so angry

I don’t really know what else to do. I love my SO so much but I feel like i get angry about everything. He’s the first healthy relationship I’ve had but I feel like I’m always trying to find something wrong with him.. it’s ruining us and I don’t want to lose him. I seem to get angry about the dumbest stuff and I don’t want to be like that.. can someone please help me I don’t want to lose him.