I tried to use bitcoin to buy ethereum and failed, what will happen now? I tried to use some at the shifty exchange in the ethereum app, just for research. I sent money to the provided payment adress, but I think I included a to small fee.

My payment is now uncofirmed and in shifty the deal is expired, What will happen now with the bitcoin etc?
The Bitcoin won't magically revert back to your wallet. Contact the exchange and let them know, and they'll handle it, either by processing the exchange or refunding you.