What do you think about me not speaking a language?
It seems that you can type in English. What stops you from speaking?
I'd just prefer to read books rather than speak out loud to others.
Your response was quite clear so you do definitely speak at least one language! Unless you can only write and not speak at all.
Maybe I can speak, but I just prefer not to. Is there something wrong with that?
There's nothing wrong with not liking to speak a whole lot, but knowing at least one language is important to getting through life. If no one could understand you then there would be a lot of issues for you.