I am trying to sell all my Shiba tokens from my Coinbase wallet (to Ethereum). I tried converting it through Uniswap, but nothing seemed to happen. So I did it again. And then through Sushiswap. I thought that there was a mistake since nothing seemed to happen, but I can now see on Etherscan that I have 3 pending transactions. Am I going to pay the gas fees for all these transactions? Is it normal that they are pending for several hours?
You did not post a link to your address so it is difficult to pinpoint the exact cause. However, you most likely sent your first swap with a gas price that was too low.
Because of that, it has not yet been picked up by the miners. Any subsequent transaction will also be stalled regardless of their gas price (transactions are always processed in order).