how to hold a conversation longer

I can’t hold a conversation for more than a few sentences, like “hi, how are you?” and some greetings. That’s all that comes to my mind. And when it comes to making a conversation interesting, my mind goes absolutely blank.I have almost zero face-to-face interaction experience.

I’ve been like this since childhood because my family wouldn’t let me go outside our area and experience talking to people. They were like, “You have to study hard to get a better lifestyle,” and that’s what I did. Because of that, I couldn’t enjoy much of my childhood. They didn’t let me learn about it when I was a kid, and now they expect me to have good conversation skills. My family and neighbours think that I have some kind of mental disability, that’s why I don’t speak much. I laugh at them most of the time, but after days of bad interaction experiences, their words hurt and I can’t help myself but cry about it.

How can I make a conversation fun and enjoyable at both ends? I would like to hear your suggestions and opinions on this.