Is it normal that my girlfriend hits me and blames it on her period?

Hi Im butter, this is my very first relationship with a girl (24) I met on tinder. She had same interests as me we loved reading books so we clicked together, after two months of talking I confessed and she said yes I was so happy and grateful I felt so lucky. We started to hang out more often. I’m an introvert and very cautious emotionally and I am respectful to her. But lately now when I decided to spend more time with her she tends to get really aggressive and she easily gets angry at me even for things that are out of my control. especially when we’re hanging out with her friends and she says she is having her period. When I ask later why she does that she always say “Im sorry but don’t worry it’s pretty normal for girls during period and cramps to get a little upset everyone does that” and I thought that must be the true. Until it happened multiple times and again and again.

But I don’t know what to do anymore, since as an introvert I’m not very good at communicating or being open, especially now that I’m emotionally attached to her. I don’t even know if I will get another girlfriend if I leave her given how I am. What do I do? Is that really normal?

Is it normal that my girlfriend hits me and blames it on her period?
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