I'm very emotional, what should I do?

Since I was a little girl, no matter what, when a little person comes at me, my eyes fill with tears and I start to cry, and this happens without my control, it happens all the time, and the people around me, my family, my friends, start to get angry because I always get it, not all the time, but when someone starts to walk towards me even a little bit. When he raises his voice, my eyes fill with tears and I cry. How can I solve this or why does this happen?
I'm very emotional, what should I do?
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