Is it smart to sell a car to Carmax?

To keep it simple. I owe about 21K on my loan. A 2022 Corolla Cross. I put my vehicle into Carmax and they offered about the same amount, maybe $300 less. Car is pretty much brand new with 16k miles. I know better than not to carry over a negative balance and get into another loan, but let’s say that hypothetically they did offer an amount of 21k and I paid off my loan, would that be advisable? Does the site even honor the original price? Like I said, car is literally brand new.

If you wanna keep reading and recommend me some options I’ll be more than happy to hear you out. See, this is the thing. I brought a car at the worst possible time in a hurry because my 4th school year was starting and my dad couldn’t drive me anymore. I’m 23 and I want a fun car to drive. I drove my friend’s Accord Touring and was like “This is exactly what I want.” I just want a fun car for my age and wouldn’t mind looking into some sedans that are fun to drive. As much as I love my car for taking care of me these last 2 and a half years I gotta say its incredibly boring.

Thanks!