Assuming you mean your mouse double clicks when you only intended to single click. There are three possibilities.

First, it could be that the interval for double click is set too long and every time you click a second time the operating system thinks it is a double click instead. Each operating system would have a different place where you can change this setting.

Second the driver could be corrupt or just “bad”. You could try to re-install it or search for an updated driver.

Lastly (and the most common), the spring in the sensor under that mouse button has bent and doesn’t work as well as it should. Here’s a guide to try and repair it: Repair Mouse With Double Click Problem. Note though, that’s a lot of fiddly work, and for a cheapie mouse I’d likely just buy a new one instead – only for some expensive gaming mouse would I consider going through all that hassle.