If a person is naturally left handed, but is forced to "change" when they're small, can it affect their intellectual and mental development?

There was a time when being left handed was a big no no for some stupid reason. My folks had some friends and it’s said that their youngest son was born left handed, and they forced him to use his right, like to write with. They say he had problems learning in school for the first three years. Then they switched him back and the learning problems disappeared.

Mom says I was born left handed, and Dad made go right handed. I kinda think that’s possible, as I do a lot of things kind of bass ackwards! For one thing, I’m left eye dominate too, which the doctor said is unusual. When I’m sighting down a gun I end up in this kind of contorted position in trying to sight with my left eye and shoot with my right. When I first started playing basketball, when I was making free throws, I automatically put my left foot forward, which, of course, threw me off balance when I actually shot, with my right hand.

I just wonder if that kind of thing can really affect a person in a negative way.

Also…I wonder why back in the day people had such an issue with their kids being left handed….