Crying is not a mental breakdown just like laughing is not a mental breakdown. It’s a natural expression of an emotion and it’s healthy - it helps you get rid of cortisol, so you should WANT to cry in appropriate circumstances just like you want to laugh. It’s a natural bodily mechanism that is good for you. You viewing it negatively and as a weakness stems from the toxic approach to these things in the culture you grew up in (and probably still live in, unfortunately).