How do I unlearn behaviors?

Anonymous
I’m 20. I’m small and I generally avoid altercations. However that does not mean they avoid me. People tend to be quite aggressive with me. I thought that if I laughed it off or pretended that it didn’t bother me I would look strong and resilient. But honestly I just internalized everything. I’m sad. I let people say whatever to me. I let people do whatever. I am trying to work on myself and that’s one of my biggest issues. I let everyone run over me since I was younger. It just progressively got worse. And now here I am. 20 and still getting treated like a child by people my own age. I can’t deal with this any longer. I don’t know how to reintroduce myself though. How do I begin to become more outspoken and not awkwardly laugh t things off? I don’t know how to begin to undo what I let go on. I want to start right now tofay. I can’t blame everyone for what I let them get away with. I am an adult now. I just need to start asserting myself. But here do I start? How do I make it stick?
How do I unlearn behaviors?
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