Usdc coin not able to be used?

Hello- I sent usdc from coinbase to my meta mask account. I received the coins but now I can’t do anything with them? My account balance shows the coins amount in dollars but when I go to send the usdc off meta mask it will only allow me to send my Eth amount off when I then tried to swap my usdc for eth on meta mask it will not allow me. Why is metamask showing the balance of my usdc in USD terms but not allowing me to do anything with it?