Why am I so easily influenced?

I am so easily influenced and swayed in opinion and I don't want to be like that and ik it's dangerous, but I can't help it. This may or may not be part of this, but whenever I get mad about something that happened or is happening I get very intensely mad until randomly a switch goes off in my brain and I am completely calm and chill about the situation. EX: I am at a friends house, he's about to text to my crush that I like him, I immediately lunge at him and scratch him to try and get the phone, he sends the text, I punch him and angrily explain why that was so dumb, switch goes off, I sit down and say "actually its fine, I don't really care that much" and I'm calm for the rest of that time. I think it's starting to scare my friends a little.

Why am I so easily influenced?
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