Dreaming about carrots specifically can mean you want to eat healthier in your life. This is similar to dreaming about apples and just means that you want to eat better as carrots are seen as a healthy vegetable. It can also mean you want to improve your vision and your ability to see things coming.
The reason for this is that people commonly associate carrots with better eyesight despite this being a myth. Dreaming about carrots could mean you want to have better eyesight, or in literal terms, better foresight and ability to see things in your own life as they happen and before they happen.