Remix Solidity 0.8.x – Unable to Withdraw/Transfer Funds from Contract

I wanted to create a contract where wallets can deposit and withdraw funds, to test the re-entrancy attack.

However, on deploying this contract in Remix VM (London), I'm unable to withdraw using the withdrawAll() and withdraw() functions even when my indicated amount is < deposited funds.

The error is:

transact to Victim.withdraw errored: VM error: revert.
revert
The transaction has been reverted to the initial state.
Note: The called function should be payable if you send value and the value you send should be less than your current balance.

Here's the code, please let me know where I did wrong?

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract Victim {
    mapping(address => uint256) public balances;

    function deposit(uint256 _amount) public {
        balances[msg.sender] += _amount;
    }
  
    function withdrawAll() public payable {
        uint256 amount = balances[msg.sender];         
        require(amount <= balances[msg.sender], "too much!");
        payable(msg.sender).transfer(amount);
        // uint256 new_balance = balances[msg.sender] - amount;
        balances[msg.sender] = 0;
  }

    function withdraw(uint256 amount) public payable {
        require(amount <= balances[msg.sender], "too much!");
        payable(msg.sender).transfer(amount);
        balances[msg.sender] -= amount;
    }
  

}