Caught My Girlfriend messing with a Cucumber

Hi Love Opera

My name is John, I have been in a 2 year relationship with my girlfriend, and from all aspects, everything has been fine until two weeks ago, I came home from work to see my girlfriend having s*x with a cucumber, yes, a cucumber, least to say I was really freaked out. 

 I haven’t felt so embarrassed in my life and to add insult to injury, before I came into the room, she sound like she was enjoying it more than she enjoys my P*nis. 

I just feel inadequate as a man, and I want to ask her the reason behind her having s*x with veggies, but I don’t want to makes things even more awkward.