My mouse broke and now I'm trying to play with the touchpad, the problem is that with the touchpad I can't turn the camera while walking, and it bothers me a lot.

This is a problem with your touchpad drivers and not something classicube does. 
 

the feature causing this is usually called palm rejection and the easiest way of working around it is buying a $5 external mouse from goodwill and not using your touchpad

just get used to it i use trackpad to play classicube

You could search up how to disable that certain setting for your computer, or you could get a external mouse (highly inexpensive if you look in the right places).