Camera Rotates Upon Play Button Clicked

So I'm trying to make a first-person game so I've placed a camera inside a cylinder, which I'm using as a body for now, and for some reason every time I click play to load the scene, the camera rotates to the right a fair amount. When I stop testing it, the camera resets and I'm not moving my mouse when it starts so it can't be that. The rest of the player doesn't move, only the camera does. I'm using Unity 2018.4.23f1. I would greatly appreciate some help and just so you know, I'm relatively new to unity.

Cheers.

 

So it will only rotate if it is told to rotate. That would be caused by either a physics interaction (if a rigidbody is involved) or by a script or other component telling it to rotate. I have no idea what you have attached to the camera or what other things reference this camera, so can't really speculate further.

 

Okay, thanks for letting me know. I'll see if it is caused by those things

 

I can't find the issue however I have narrowed it down to this script.
Maybe I'm just being dumb but I don't know what it could be.