How can I adjust this camera script to change the character rotation as well?

I have made/adjusted this camera script to keep the player's mouse in the front of the screen. However, no matter how the character rotates (WASD or with the mouse) I want the character's backside to always be shown. I am working on making a shooter game so I don't want you to be able to shoot facing a different direction. I think what I might want to do is constantly update the character's body angle to the mouse rotation but I don't know how to go about that. Any suggestions/help? I will post the script I have below.

--Services
local userInputService = game:GetService("UserInputService")
local runService = game:GetService("RunService")

--Player & Character
local localPlayer = game:GetService("Players").LocalPlayer

--Other
local Camera = game:GetService("Workspace").CurrentCamera

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--- VALUES ---
--------------

local xAngle = 0
local yAngle = 0
local cameraPos = Vector3.new(2.5,0.75,10)

----------------------
--- INITIALIZATION ---
----------------------

wait(1)
Camera.CameraType = Enum.CameraType.Scriptable
userInputService.MouseBehavior = Enum.MouseBehavior.LockCenter

-----------------
--- FUNCTIONS ---
-----------------

userInputService.InputChanged:Connect(function(input)
    --if input.UserInputType == Enum.UserInputType.MouseMovement then
        xAngle = xAngle-input.Delta.x*0.4
        --print(xAngle-input.Delta.x*0.4)
        --Clamp the vertical axis so it doesn't go upside down or glitch.
        yAngle = math.clamp(yAngle-input.Delta.y*0.4,-80,80)
    --end
end)

runService.RenderStepped:Connect(function()
    local Character = localPlayer.Character
    local rootPart = Character:FindFirstChild("HumanoidRootPart")
    if Character and rootPart then
        --Set rotated start cframe inside head
        local startCFrame = CFrame.new((rootPart.CFrame.p + Vector3.new(0,2,0)))*CFrame.Angles(0, math.rad(xAngle), 0)*CFrame.Angles(math.rad(yAngle), 0, 0)

        --Set camera focus and cframe
        local cameraCFrame = startCFrame + startCFrame:vectorToWorldSpace(Vector3.new(cameraPos.X,cameraPos.Y,cameraPos.Z))
        local cameraFocus = startCFrame + startCFrame:vectorToWorldSpace(Vector3.new(cameraPos.X,cameraPos.Y,-50000))

        Camera.CFrame = CFrame.new(cameraCFrame.p,cameraFocus.p)
    end
end)