Frustration

I've been feeling very conflicted lately. My dad is easily my favorite person in the world. I'm a Daddy's Girl to the T. I've never been able to keep things from him, even if I tried to keep something like a birthday present from him. That changed  few years ago. There is something that I've been wanting to talk with him about that no matter how hard I try....I can't. I've thought about just writing everything I'd like to say and have him read it but I can't even get my thoughts written down fluidly. I must have tried a couple hundred times. It makes me so mad that one thing can shake up everything so much. How do I over come this? I want to be able to talk about it and write clearly about it. I want to desperately. I need to get this off my chest and stop lying to my dad. Even though I'm not lying to him about anything, I'm not telling him about anything. That's lying by omission in my book. I don't know. I'm super frustrated. Grrrrrr.