So i am making a third person shooter and i am having trouble aiming. Whats wrong?

So here is my script it controls all things for now like animations and the aiming. The aiming stuff is at the end of the script. I was wondering if i can make it so i can rotate root but not rotate the legs. Here is a gif of the problem. Gyazo Gif

wait()
local WA = Instance.new("Animation")
local IA = Instance.new("Animation")
local SA = Instance.new("Animation")
local AA = Instance.new("Animation")
local JA = Instance.new("Animation")
JA.AnimationId = "rbxassetid://2722201562"
AA.AnimationId = "rbxassetid://2719070294"
SA.AnimationId = "rbxassetid://2719102937"
WA.AnimationId = "rbxassetid://2719079532"
IA.AnimationId = "rbxassetid://2719075199"
local humanoid = script.Parent.Humanoid
local AimAnimation = humanoid:LoadAnimation(AA)
local WalkAnimation = humanoid:LoadAnimation(WA)
local IdleAnimation = humanoid:LoadAnimation(IA)
local SprintAnimation = humanoid:LoadAnimation(SA)
local IsIdle = false
local UserInputService = game:GetService("UserInputService")
local Camera = game.Workspace.CurrentCamera
local Char = script.Parent
local Aiming = false
local Plr = game.Players.LocalPlayer
local Mouse = Plr:GetMouse()

humanoid.Running:Connect(function(s)
if s > 1 then
IdleAnimation:Stop()
WalkAnimation:Play()
IsIdle = false
else
WalkAnimation:Stop()
IdleAnimation:Play()
IsIdle = true
end
end)

local XOffset = 1
local Y = 1
game:GetService("UserInputService").InputBegan:connect(function(inputObject, gameProcessedEvent)

    
    if inputObject.KeyCode == Enum.KeyCode.LeftShift and IsIdle == false then
	
   
    SprintAnimation:Play()
    humanoid.WalkSpeed = 20

end

local inputType = inputObject.UserInputType
   if inputType == Enum.UserInputType.MouseButton2 then
        Aiming = true
        humanoid.WalkSpeed = 0
        AimAnimation:Play()

    end


end)

game:GetService("UserInputService").InputEnded:Connect(function(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.LeftShift then
	
   
    SprintAnimation:Stop()
    humanoid.WalkSpeed = 3

end


local inputType = inputObject.UserInputType
   if inputType == Enum.UserInputType.MouseButton2 then
        Aiming = false
        humanoid.WalkSpeed = 3
        AimAnimation:Stop()
    end

if inputObject.KeyCode == Enum.KeyCode.Space then
	humanoid.FallingDown:Connect(function(isActive)
		
		

    end)
end

end)

UserInputService.InputChanged:connect(function(IO)
	if IO.UserInputType == Enum.UserInputType.MouseMovement then
		X = IO.Delta.X/150
		if Y-IO.Delta.Y/150 < 1 and IO.Delta.Y < 0 then
			Y = Y-IO.Delta.Y/150
		elseif Y-IO.Delta.Y/150 > -1 and IO.Delta.Y > 0 then
			Y = Y-IO.Delta.Y/150
			
			
		end
		if Y > 1 then
			Y = 1
		elseif Y < -1 then
			Y = -1
		end
		
	end
	end)
	

	
game["Run Service"].RenderStepped:connect(function()
	if Aiming == true then
	Camera.CFrame = Char.HumanoidRootPart.CFrame * CFrame.new(Vector3.new( 0,2.5,.25)+Char.Humanoid.CameraOffset)*CFrame.fromEulerAnglesXYZ(Y,0,0)*CFrame.new(XOffset,0,6)
	Char.HumanoidRootPart.CFrame = Char.HumanoidRootPart.CFrame * CFrame.fromEulerAnglesXYZ(0,-X,0)	
	Char.LowerTorso.Root.C0 = CFrame.Angles(math.rad(Camera.CFrame.lookVector.Y*90),0,0)	
	
	X = 0
	end
end)

i cant use Char.UpperTorso.Waist because it aims at a weird angle and i dont know how to work with that.