My gf and I have been together for about a year. I understand

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My gf and I have been together for about a year. I understand that I'm not exactly the most mature person in the world. She gets mad at me for almost everything even of it's small, meanwhile I have never been mad at her. I am extremely patient and I hate to say this but the only time we ever argue is if she's upset with me for some miniscule reason. She once got mad at me because I got a time wrong.
>hey babe it looks like it's gonna be an hour an a half.
She says " oh so we'll get there around 5:00?"
>no 4, oh wait. You're right sorry babe.
>she's visibly mad
"You always do that to me anon! You're always telling me I'm wrong"
>what? I never do that. Why are you like this? I never once did that to you.

Another time during chemistry lab
>okay babe the test tube turned blue
"no babe it's not completely blue"
>babe, even if it's a little blue, it's still blue
"no! I'm gonna do it again!"
>same result

Whenever she's mad at me, she won't tell me the reason why. I have to pick at it every time. And she lies to me saying she's okay but she's obviously not. Eventually we talk it out but she won't be an adult about it.

Tl;dr gf is never straight forward when upset with me and always lashes out on me when I'm being myself.

I mean i am 21. Am I too young to understand women?