You must have awkward fingers

All 3d applications need mouse and fingers at the same time if you want to use them efficiently.
But I still believe your fingers are ok. The problem is just in your mind. If you you stop lerning because of negative energy then it is very sad. It will stop you everywhere. ZBrush is very different too. Bodypaint is different. An electrical screw driver is different too and it also needs both hands to handle it efficiently though you might use the smaller ones with one hand only.