How do I stop gun from shooting when uneqipped?

When I unequip my gun, it still shoots from the last place the shootPart was. Also, when spamming 1 (or whatever backpack slot its in) it shoots way faster than intended. This is my script:

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local tool = script.Parent


local mouseDown = false
local canPlay = true
local sound = script.Parent.shoot
local mouse = game.Players.LocalPlayer:GetMouse()


mouse.Button1Down:Connect(function()
	mouseDown = true
end)

mouse.Button1Up:Connect(function()
	mouseDown = false
end)


tool.Equipped:Connect(function()
	
	while wait(0.2) do
		if mouseDown then
			if canPlay then
				canPlay = false
				
				local ray = Ray.new(tool.shootPart.CFrame.p, (mouse.Hit.p - tool.shootPart.CFrame.p).unit * 300)
				local part, position = workspace:FindPartOnRay(ray, player.Character, false, true)
				
				local beam = Instance.new("Part", workspace)
				beam.BrickColor = BrickColor.new("Brick yellow")
				beam.FormFactor = "Custom"
				beam.Material = "Neon"
				beam.Transparency = 0.5
				beam.Anchored = true
				beam.Locked = true
				beam.CanCollide = false
				
				local distance = (tool.shootPart.CFrame.p - position).magnitude
				beam.Size = Vector3.new(0.1, 0.1, distance)
				beam.CFrame = CFrame.new(tool.shootPart.CFrame.p, position) * CFrame.new(0, 0, -distance / 2)
				
				game:GetService("Debris"):AddItem(beam, 0.1)
				
				if part then
					local humanoid = part.Parent:FindFirstChild("Humanoid")
					
					if not humanoid then
						humanoid = part.Parent.Parent:FindFirstChild("Humanoid")
					end
					
					if humanoid then
						humanoid:TakeDamage(49)
					end
				end
				
				sound:Play()
				
				canPlay = true
			end
		end
	end
end)

I'm a fairly new scripter so any help is appreciated.

use tool.Activated or check if the tool parent is a player/have a humanoid before it shoots

Tool.Activated can be found here: https://developer.roblox.com/en-us/api-reference/event/Tool/Activated