Is my honey fermenting?
Yes, your honey started to ferment. 
I assume the fermenting process is still fresh as you mention the honey taste didn't changed (later it change taste to beer-like). With time yeast can produce alcohol or vinegar from carbs in honey. 

You can still use this honey for baking or making mead. Unfortunately the only way to stop the process it to heat honey to 80C to kill yeast.  

The fermentation in honey can be due to gathering honey too soon so there's to high amount of water in it or not properly creaming it.