Buy bnb on Binance and then go to the wallet, get the bnb deposit address and make a normal transfer from Binance to this bnb address within the wallet.

Can someone help??? I bought a coin in the wallet on Binance Web 3, it appreciated, and I wanted to withdraw, but I'm not able to, it says I don't have BNB for the transfer, so I added another 11 dollars but even so when I try to exchange for BNB it says the same thing, that I only have enough for the fee...?? Has anyone gone through this and can explain?? Maybe I'm doing something wrong and just don't know it.